x^2+18x-11664=0

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Solution for x^2+18x-11664=0 equation:


Simplifying
x2 + 18x + -11664 = 0

Reorder the terms:
-11664 + 18x + x2 = 0

Solving
-11664 + 18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '11664' to each side of the equation.
-11664 + 18x + 11664 + x2 = 0 + 11664

Reorder the terms:
-11664 + 11664 + 18x + x2 = 0 + 11664

Combine like terms: -11664 + 11664 = 0
0 + 18x + x2 = 0 + 11664
18x + x2 = 0 + 11664

Combine like terms: 0 + 11664 = 11664
18x + x2 = 11664

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 = 11664 + 81

Reorder the terms:
81 + 18x + x2 = 11664 + 81

Combine like terms: 11664 + 81 = 11745
81 + 18x + x2 = 11745

Factor a perfect square on the left side:
(x + 9)(x + 9) = 11745

Calculate the square root of the right side: 108.374351209

Break this problem into two subproblems by setting 
(x + 9) equal to 108.374351209 and -108.374351209.

Subproblem 1

x + 9 = 108.374351209 Simplifying x + 9 = 108.374351209 Reorder the terms: 9 + x = 108.374351209 Solving 9 + x = 108.374351209 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 = 108.374351209 + -9 Combine like terms: 9 + -9 = 0 0 + x = 108.374351209 + -9 x = 108.374351209 + -9 Combine like terms: 108.374351209 + -9 = 99.374351209 x = 99.374351209 Simplifying x = 99.374351209

Subproblem 2

x + 9 = -108.374351209 Simplifying x + 9 = -108.374351209 Reorder the terms: 9 + x = -108.374351209 Solving 9 + x = -108.374351209 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 = -108.374351209 + -9 Combine like terms: 9 + -9 = 0 0 + x = -108.374351209 + -9 x = -108.374351209 + -9 Combine like terms: -108.374351209 + -9 = -117.374351209 x = -117.374351209 Simplifying x = -117.374351209

Solution

The solution to the problem is based on the solutions from the subproblems. x = {99.374351209, -117.374351209}

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