x^2-8x-108=0

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Solution for x^2-8x-108=0 equation:


Simplifying
x2 + -8x + -108 = 0

Reorder the terms:
-108 + -8x + x2 = 0

Solving
-108 + -8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + -8x + 108 + x2 = 0 + 108

Reorder the terms:
-108 + 108 + -8x + x2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + -8x + x2 = 0 + 108
-8x + x2 = 0 + 108

Combine like terms: 0 + 108 = 108
-8x + x2 = 108

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 108 + 16

Reorder the terms:
16 + -8x + x2 = 108 + 16

Combine like terms: 108 + 16 = 124
16 + -8x + x2 = 124

Factor a perfect square on the left side:
(x + -4)(x + -4) = 124

Calculate the square root of the right side: 11.135528726

Break this problem into two subproblems by setting 
(x + -4) equal to 11.135528726 and -11.135528726.

Subproblem 1

x + -4 = 11.135528726 Simplifying x + -4 = 11.135528726 Reorder the terms: -4 + x = 11.135528726 Solving -4 + x = 11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 11.135528726 + 4 Combine like terms: -4 + 4 = 0 0 + x = 11.135528726 + 4 x = 11.135528726 + 4 Combine like terms: 11.135528726 + 4 = 15.135528726 x = 15.135528726 Simplifying x = 15.135528726

Subproblem 2

x + -4 = -11.135528726 Simplifying x + -4 = -11.135528726 Reorder the terms: -4 + x = -11.135528726 Solving -4 + x = -11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -11.135528726 + 4 Combine like terms: -4 + 4 = 0 0 + x = -11.135528726 + 4 x = -11.135528726 + 4 Combine like terms: -11.135528726 + 4 = -7.135528726 x = -7.135528726 Simplifying x = -7.135528726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.135528726, -7.135528726}

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