x^2+18x-180=0

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Solution for x^2+18x-180=0 equation:


Simplifying
x2 + 18x + -180 = 0

Reorder the terms:
-180 + 18x + x2 = 0

Solving
-180 + 18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + 18x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + 18x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 18x + x2 = 0 + 180
18x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
18x + x2 = 180

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 = 180 + 81

Reorder the terms:
81 + 18x + x2 = 180 + 81

Combine like terms: 180 + 81 = 261
81 + 18x + x2 = 261

Factor a perfect square on the left side:
(x + 9)(x + 9) = 261

Calculate the square root of the right side: 16.155494421

Break this problem into two subproblems by setting 
(x + 9) equal to 16.155494421 and -16.155494421.

Subproblem 1

x + 9 = 16.155494421 Simplifying x + 9 = 16.155494421 Reorder the terms: 9 + x = 16.155494421 Solving 9 + x = 16.155494421 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 = 16.155494421 + -9 Combine like terms: 9 + -9 = 0 0 + x = 16.155494421 + -9 x = 16.155494421 + -9 Combine like terms: 16.155494421 + -9 = 7.155494421 x = 7.155494421 Simplifying x = 7.155494421

Subproblem 2

x + 9 = -16.155494421 Simplifying x + 9 = -16.155494421 Reorder the terms: 9 + x = -16.155494421 Solving 9 + x = -16.155494421 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 = -16.155494421 + -9 Combine like terms: 9 + -9 = 0 0 + x = -16.155494421 + -9 x = -16.155494421 + -9 Combine like terms: -16.155494421 + -9 = -25.155494421 x = -25.155494421 Simplifying x = -25.155494421

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.155494421, -25.155494421}

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