5x^2+20x-36=0

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Solution for 5x^2+20x-36=0 equation:


Simplifying
5x2 + 20x + -36 = 0

Reorder the terms:
-36 + 20x + 5x2 = 0

Solving
-36 + 20x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-7.2 + 4x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + 4x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + 4x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + 4x + x2 = 0 + 7.2
4x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
4x + x2 = 7.2

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 7.2 + 4

Reorder the terms:
4 + 4x + x2 = 7.2 + 4

Combine like terms: 7.2 + 4 = 11.2
4 + 4x + x2 = 11.2

Factor a perfect square on the left side:
(x + 2)(x + 2) = 11.2

Calculate the square root of the right side: 3.346640106

Break this problem into two subproblems by setting 
(x + 2) equal to 3.346640106 and -3.346640106.

Subproblem 1

x + 2 = 3.346640106 Simplifying x + 2 = 3.346640106 Reorder the terms: 2 + x = 3.346640106 Solving 2 + x = 3.346640106 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 3.346640106 + -2 Combine like terms: 2 + -2 = 0 0 + x = 3.346640106 + -2 x = 3.346640106 + -2 Combine like terms: 3.346640106 + -2 = 1.346640106 x = 1.346640106 Simplifying x = 1.346640106

Subproblem 2

x + 2 = -3.346640106 Simplifying x + 2 = -3.346640106 Reorder the terms: 2 + x = -3.346640106 Solving 2 + x = -3.346640106 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -3.346640106 + -2 Combine like terms: 2 + -2 = 0 0 + x = -3.346640106 + -2 x = -3.346640106 + -2 Combine like terms: -3.346640106 + -2 = -5.346640106 x = -5.346640106 Simplifying x = -5.346640106

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.346640106, -5.346640106}

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