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# Graph Presentation “Parabola” Of A Quadratic Equation

### Introduction Of The Quadratic Equation:

The second-degree polynomial equation which has only one unknown variable is known as Quadratic equation. The standard form of Quadratic equation is as $$ax^2+ bx+c=0$$ and the formula for Quadratic equation is $$x = \dfrac{ -b \pm \sqrt{b^2 – 4ac}}{2a}$$. New inventions have made our work much easier just like Quadratic formula calculator which is the great Quadratic equation solver just put the values of a, b, & c and get your answer instantly.

### Methods Use To Solve The Quadratic Equation:

There are four methods to solve quadratic equations: Quadratic formula, completing the square method, factoring method, & the graphing. Amazing thing is that there are different Quadratic function calculators available online to solve quadratic equations in less time just like Quadratic formula calculator, & factoring quadratics calculator etc.

If you are not good at factoring and find the quadratic function calculator or find the best Quadratic equation solver then you are at the right place because our factoring quadratics calculator will solve your equations in minutes.

### Uses Of The Quadratic Equation:

The use of Quadratic equation is not only confined with mathematics, algebra, & geometry but in any field like chemistry, physics, daily science, and in accounting if we find any equation which has at least one square value or in Quadratic standard form then we may solve that equation by any of the above-mentioned methods. So, if you belong to any field and want to solve quadratic equations then you may also use Quadratic formula calculator or Quadratic function calculator without searching the formula for Quadratic equation.

### Graphing Or Sketch Parabola Of The Quadratic Equation:

If we solve quadratic equations graphically then it shows u shaped upwards and downwards and this u shaped is known as parabola. In Quadratic equation if the value of a is equal to 1 or greater than 1 then parabola opens upwards and if the value of a is less than 1 then parabola opens downwards as shown in the following:

Let’s understand the graphing of the quadratic equation by an example:

### Example To Solve Quadratic Equation By Graph (Parabola):

Solve the quadratic equation by graph

$$y = x^2 – 3x – 1$$

Now we put the values of x to find the values of y:

If $$x = -2, y = (-2)^2 – 3 (-2) – 1 = 9$$

If $$x = -1, y = (-1)^2 – 3 (-1) – 1 = 3$$

If $$x = 0, y = (0)^2 – 3 (0) – 1 = – 1$$

If $$x = 1, y = (1)^2 – 3 (1) – 1 = – 3$$

If $$x = 2, y = (2)^2 – 3 (2) – 1 = – 3$$

If $$x = 3, y = (3)^2 – 3 (3) – 1 = – 1$$

If $$x = 4, y = (4)^2 – 3 (4) – 1 = 3$$

If $$x = 5, y = (5)^2 – 3 (5) – 1 = 9$$

$$X: -2, -1, 0, 1, 2, 3, 4, 5$$

$$Y: 9, 3, -1, -3, -3, -1, 3, 9$$

In the above quadratic equation, we computed the coordinates for eight points. We noted that the plotting of any number of points for which x is less than 3 is not giving a shape of the curve and when the values of x are greater than 3 then it is giving a curve shape. Thus, it is important to choose the values of x for plotting the graph and generally we should determine at least five well-chosen values of x for getting an accurate sketch of a quadratic equation. We can see in the above graph that if the value of a is equal to 1 or a is positive then the parabola is opening upwards.

### Concepts That Are Related With The Graph Of Quadratic Equation:

Now we discuss the following concepts which are associated with the graph of Quadratic equation:

1. Roots.
2. Discriminant.
3. Vertex.
4. X-intercept.
5. Y-intercept.

#### Roots:

The Quadratic formula is also known as the roots of the quadratic equation and the formula for Quadratic equation is as:

$$x = \dfrac{ -b \pm \sqrt{b^2 – 4ac}}{2a}$$

We can write the roots of the quadratic equation as:

Root for $$x = \dfrac{ -b + \sqrt{b^2 – 4ac}}{2a}$$

Root for y $$x = \dfrac{ -b – \sqrt{b^2 – 4ac}}{2a}$$

#### Discriminant:

In Quadratic formula the part $$b^2 – 4ac$$ is known as Discriminant and it is represented by D and the nature of the roots of the quadratic equation depends on the value of the D.

If The Value Of The D = 0:

The roots of the quadratic equation will be equal.

If The Value Of The D Is Greater Than 0:

The roots of the quadratic equation will be real.

If The Value Of The D Is Less Than 0:

The roots of the quadratic equation will be imaginary.

If The Value Of The D Is Not A Perfect Square And Greater Than 0:

The roots of the quadratic equation will be irrational.

If The Value Of D Is A Perfect Square And Greater Than 0:

The roots of the quadratic equation will be rational.

If The Values Of A, B, & C Are Integers And The Value Of D Is Greater Than 0 And Also A Perfect Square:

The roots of the quadratic equation will be integers.

### Vertex:

In a Quadratic equation graph parabola, the maximum and the minimum point is known as vertex. We find the vertex of the quadratic equation by the following formulas:

Vertex for $$x = \dfrac{-b}{2a}$$

.

Vertex for $$y = \dfrac{-b^2 – 4ac}{4a}$$

.

We can also write the above vertex formulas as:

Vertex for $$x = h = \dfrac{-b}{2a}$$

.

Vertex for $$y = k = \dfrac{-D}{4a}$$

.

### X-Intercept:

In the quadratic equation if we want to find the x-intercept then we will put the value of y as 0 and will solve the equation simply by adding and subtracting.

### Y-Intercept:

Similarly, if we want to find out the y-intercept then we will put the value of the x as 0 and will solve the equation in a simple way.

So, if you are new to solving the quadratic equation graphically then from the above discussion you will be able to sketch the parabola of the Quadratic equation. In solving the quadratic equation if you are facing any problem and you are finding the quadratic equation solver and finding the formula for Quadratic equation or trying to solve quadratic equation by Quadratic function calculator then try our Quadratic formula calculator and get flying colors in your assignment.

# Completing The Square Method To Solve The Quadratic Equation

As we know, solving the quadratic equation by using the Quadratic formula is quite easy. But when it is said to solve the Quadratic equation by completing the square method then students get a little bit confused. If you are included in those who are finding Quadratic equation solvers or to find the quadratic function calculator to solve quadratic equations by completing square method, don’t worry we will completely guide you how you will solve these quadratic equations.

### Completing The Square Method To Solve The Quadratic Equation

In completing the square method, we follow the following steps:

#### Step# 1 Transposition The Equation:

First transpose the equation if needed.
OR write the quadratic equation in standard form.

#### Step # 2 Make The Coefficient Of X Is Equal To 1:

Divide the exponent of the x by the whole equation to make the coefficient of x is equal to 1.

#### Step # 3 Make A Perfect Square:

Add the value $$(½ × coefficient of x)^2$$ to each side of the equation to make it a perfect square.

#### Step # 4: Simplify The Equation:

Convert the left side of the equation into square form and simplify the values of the right side of the equation.

#### Step # 5 Take The Square Root:

Take the square root of the both sides of the equation and solve the equation with basic rules like add and subtract then finally after solving the equation we will get the value of x or required solution sets.

Let’s understand the completing the square method to solve the quadratic equations by the following examples:

#### Example# 1:

Solve the equation by completing the square method.

$$X^2 – 2x = 2$$

Solution:

Here we skip the first and second step because the equation is already in standard form and there is no need to make the exponents of x equal to 1. Now let’s start other steps:

Add $$(\frac{1}{2} × b)^2 = (\frac{1}{2} × -2)^2 = (-1)^2 = 1$$ on the both sides of the equation,

$$X^2 – 2x + 1 = 2 + 1$$

$$(x-1)^2 = 3$$

Now taking square root on both sides of the equation,

$$\sqrt{(x-1)^2} = \sqrt{3}$$

$$x-1 = \pm \sqrt{3}$$

$$x = 1 \pm \sqrt{3}$$

Solution sets {$$1 – \sqrt{3}$$, $$1 + \sqrt{3}$$} Answer.

#### Example# 2:

Solve the equation by completing the square method:

$$12 = 4x + 5x^2$$

#### Solution:

By transposition the equation we have,

$$5x^2 + 4x = 12$$

Now divide the exponent of x by the whole equation to make it equal to 1,

$$\dfrac{5x^2}{5} + \dfrac{4x}{5} = \dfrac{12}{5}$$

$$x^2 + \dfrac{4x}{5} = \dfrac{12}{5}$$

Add $$(\dfrac{1}{2} × coefficient of x)^2$$

We have $$(\dfrac{1}{2} × \dfrac{4}{5})^2 = (\dfrac{4}{10})^2 = 16/100$$

as $$\dfrac{16}{100}$$ cuts by the table of $$4 = \dfrac{4}{25}$$

Add $$\dfrac{4}{25}$$ on both sides of the equation,

$$x^2 + \dfrac{4}{25}x + \dfrac{4}{25} = \dfrac{12}{5} + \dfrac{4}{25}$$

Note:

At the left side of the equation the square term is $$x^2 + \dfrac{4}{25}$$ we can write it as

$$(x + \dfrac{2}{5})^2$$ Now it is as $$(a + b)^2$$ so, we apply the formula $$a^2 + 2ab + b^2$$ and here $$a = x$$ & $$b = \dfrac{2}{5}$$.

$$x^2 + 2(x)(\dfrac{2}{5}) + (\dfrac{2}{5})^2 = \dfrac{12}{5} + \dfrac{4}{25}$$

$$(x + \dfrac{2}{5})^2 = \dfrac{12}{5} + \dfrac{4}{25}$$

$$(x + \dfrac{2}{5})^2 = \dfrac{60 + 4}{25}$$

$$(x + \dfrac{2}{5})^2 = \dfrac{64}{25}$$

Now taking square root on the both sides of the equation,

$$\sqrt{(x + \dfrac{2}{5})^2} = \sqrt{\dfrac{64}{25}}$$

$$x + \dfrac{2}{5} = \pm \dfrac{8}{5}$$

$$x + \dfrac{2}{5} = \dfrac{8}{5}$$ OR $$x + \dfrac{2}{5} = -\dfrac{8}{5}$$

$$x = – \dfrac{2}{5} + \dfrac{8}{5}$$ OR $$x = – \dfrac{2}{5} -\dfrac{8}{5}$$

$$x = \dfrac{-2 + 8}{5}$$ OR $$x = \dfrac{-2 – 8}{5}$$

$$x = \dfrac{6}{5}$$ OR $$x = \dfrac{-10}{5}$$

$$x = 1.2$$ OR $$x = -2$$

So, the solution sets {1.2, -2} Answer.

The use of Quadratic equations is not only confined with mathematics, algebra, and geometry. It is widely used in physics, chemistry, business, sports, law & management etc. The graph of Quadratic equation is known as a parabola and the amazing thing is that anything which we see in our daily life looks like a parabola then we can apply the quadratic equation.

For instance, we can find the height of a ball if a batsman hits it from ground and can find the speed of a car etc. The Quadratic equation is solved by quadratic formula, completing the square method, graph, and factoring method. We can use any one of the methods. If you are the chemistry or engineering student and finding the quadratic function calculator or finding factoring quadratics calculator then you are at the right place because our factoring quadratics calculator or our Quadratic function calculator will solve all your Quadratic related problems.

In earlier days we used calculators for adding, subtracting, multiplying, and division only but in this scientific era all other calculations we can perform in seconds through special tasks calculators just like quadratic formula calculator.

If you are in the class and in a hurry to solve quadratic equations and trying to be a quadratic equation solver, don’t waste your time just put your values in our Quadratic formula calculator and get your answer quickly. In the Quadratic function calculator, we don’t need to put the formula of the Quadratic equation.

If you are looking for a formula for Quadratic equation to solve your equation then don’t need to search the formula for Quadratic equation because in our Quadratic function calculator just put the values of a, b, & c and get the instant accurate result.

When we get introduced by the basics of algebra then we learn about base, exponent, term or order etc. After the clarity of basics, we learn about the degrees of polynomials. As we know that polynomials are based on variables, constants, and exponents. The exponents of the variables of the polynomials are based on positive integers. The polynomials are separated by plus or minus sign and each separated polynomial is known as a term. If the polynomial is based on one term is known as monomial, if based on two terms is known as binomial, and if it is based on three terms is known as trinomial. Now we know how to determine the degree of a polynomial; it is very simple. First of all, we separately add up the exponents of each term and then will select the highest one which will be called the degree of polynomial. After a little introduction about the polynomial, we come to our targeted topic, the quadratic equation. The word Quadratic is derived from a Greek word Quadratum which means double. The quadratic equation is based on the second degree of the polynomial because at least one variable in Quadratic equation is squared. The standard form of the Quadratic equation is $$ax^2 + bx + c = 0$$, where x is an unknown variable, a, b, & c are any numbers or constants and a is not equal to zero.

The formula which we use to calculate the quadratic equation is as:

$$x = -b \pm \dfrac{\sqrt{b^2 – 4ac}}{2a}$$

Example:

$$2x^2 – 8x – 24 = 0$$

In this Quadratic equation a = 2, b = – 8, & c = -24. Now apply the formula:

$$x = -(-8) \pm \dfrac{\sqrt{(-8)^2 – 4(2)(-24)}}{2(2)}$$

$$x = 8 \pm \dfrac{\sqrt{64 + 192}}{4}$$

$$x = 8 \pm \dfrac{\sqrt{256}}{4}$$

$$x = 8 \pm \dfrac{16}{4}$$

$$x = 8 + \dfrac{16}{4}$$,$$x = 8 – \dfrac{16}{4}$$

$$x = \dfrac{24}{4}$$,$$x = \dfrac{-8}{4}$$

$$x = 6$$,$$x = -2$$

Thus, solution sets [ 6, – 2] Answer.

If you are included in those persons or students who are finding the formula for Quadratic equation then our Quadratic formula calculator is here to solve your problem.

This era is of modern technology and everything is going to be digital and is easier to use. Our Quadratic formula calculator or Quadratic equation solver calculator is also very simple and easy to use so save your time and increase your marks just put the values and get the accurate result.

### Methods To Solve Quadratic Equation

There are four methods to solve the quadratic equation:

• Completing the square.

• Graphing

• Factoring

We have discussed the quadratic formula above then now we will just discuss here the most important factoring method to solve the quadratic equation. In the factoring method the quadratic equation is solved in this way that first we standardize the equation then factorizes the non-zero side and finally set each factor to zero. After this process we get the equation then we solve it easily and find the solution sets for the variable X.

In the factoring method it is essential to understand the factorization first but if you have a problem in understanding factorization and you are finding a factoring quadratics calculator for help, our factoring quadratics calculator is waiting to solve your Quadratic equation by factoring method.

### Are You Finding The Quadratic Function Calculator?

Our aim is to assist you in understanding the quadratic function and to solve quadratic equations easily. If you try to find the quadratic function calculator to get accuracy in your results then try our Quadratic function calculator because your problem will be solved here in less time with accuracy.