-5x^2-36x+36=0

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


Simplifying
-5x2 + -36x + 36 = 0

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

Solving
36 + -36x + -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 + 7.2x + x2 = 0

Move the constant term to the right:

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

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

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

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

The x term is 7.2x.  Take half its coefficient (3.6).
Square it (12.96) and add it to both sides.

Add '12.96' to each side of the equation.
7.2x + 12.96 + x2 = 7.2 + 12.96

Reorder the terms:
12.96 + 7.2x + x2 = 7.2 + 12.96

Combine like terms: 7.2 + 12.96 = 20.16
12.96 + 7.2x + x2 = 20.16

Factor a perfect square on the left side:
(x + 3.6)(x + 3.6) = 20.16

Calculate the square root of the right side: 4.489988864

Break this problem into two subproblems by setting 
(x + 3.6) equal to 4.489988864 and -4.489988864.

Subproblem 1

x + 3.6 = 4.489988864 Simplifying x + 3.6 = 4.489988864 Reorder the terms: 3.6 + x = 4.489988864 Solving 3.6 + x = 4.489988864 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.6' to each side of the equation. 3.6 + -3.6 + x = 4.489988864 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + x = 4.489988864 + -3.6 x = 4.489988864 + -3.6 Combine like terms: 4.489988864 + -3.6 = 0.889988864 x = 0.889988864 Simplifying x = 0.889988864

Subproblem 2

x + 3.6 = -4.489988864 Simplifying x + 3.6 = -4.489988864 Reorder the terms: 3.6 + x = -4.489988864 Solving 3.6 + x = -4.489988864 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.6' to each side of the equation. 3.6 + -3.6 + x = -4.489988864 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + x = -4.489988864 + -3.6 x = -4.489988864 + -3.6 Combine like terms: -4.489988864 + -3.6 = -8.089988864 x = -8.089988864 Simplifying x = -8.089988864

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.889988864, -8.089988864}

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