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 = 8.089988864 x = 8.089988864 Simplifying x = 8.089988864

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 = -0.889988864 x = -0.889988864 Simplifying x = -0.889988864

Solution

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

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