x^2-18x-117=0

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Solution for x^2-18x-117=0 equation:


Simplifying
x2 + -18x + -117 = 0

Reorder the terms:
-117 + -18x + x2 = 0

Solving
-117 + -18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '117' to each side of the equation.
-117 + -18x + 117 + x2 = 0 + 117

Reorder the terms:
-117 + 117 + -18x + x2 = 0 + 117

Combine like terms: -117 + 117 = 0
0 + -18x + x2 = 0 + 117
-18x + x2 = 0 + 117

Combine like terms: 0 + 117 = 117
-18x + x2 = 117

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 117 + 81

Reorder the terms:
81 + -18x + x2 = 117 + 81

Combine like terms: 117 + 81 = 198
81 + -18x + x2 = 198

Factor a perfect square on the left side:
(x + -9)(x + -9) = 198

Calculate the square root of the right side: 14.071247279

Break this problem into two subproblems by setting 
(x + -9) equal to 14.071247279 and -14.071247279.

Subproblem 1

x + -9 = 14.071247279 Simplifying x + -9 = 14.071247279 Reorder the terms: -9 + x = 14.071247279 Solving -9 + x = 14.071247279 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 14.071247279 + 9 Combine like terms: -9 + 9 = 0 0 + x = 14.071247279 + 9 x = 14.071247279 + 9 Combine like terms: 14.071247279 + 9 = 23.071247279 x = 23.071247279 Simplifying x = 23.071247279

Subproblem 2

x + -9 = -14.071247279 Simplifying x + -9 = -14.071247279 Reorder the terms: -9 + x = -14.071247279 Solving -9 + x = -14.071247279 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -14.071247279 + 9 Combine like terms: -9 + 9 = 0 0 + x = -14.071247279 + 9 x = -14.071247279 + 9 Combine like terms: -14.071247279 + 9 = -5.071247279 x = -5.071247279 Simplifying x = -5.071247279

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.071247279, -5.071247279}

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