x^2+18x=-59

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Solution for x^2+18x=-59 equation:


Simplifying
x2 + 18x = -59

Reorder the terms:
18x + x2 = -59

Solving
18x + x2 = -59

Solving for variable 'x'.

Reorder the terms:
59 + 18x + x2 = -59 + 59

Combine like terms: -59 + 59 = 0
59 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-59' to each side of the equation.
59 + 18x + -59 + x2 = 0 + -59

Reorder the terms:
59 + -59 + 18x + x2 = 0 + -59

Combine like terms: 59 + -59 = 0
0 + 18x + x2 = 0 + -59
18x + x2 = 0 + -59

Combine like terms: 0 + -59 = -59
18x + x2 = -59

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 = -59 + 81

Reorder the terms:
81 + 18x + x2 = -59 + 81

Combine like terms: -59 + 81 = 22
81 + 18x + x2 = 22

Factor a perfect square on the left side:
(x + 9)(x + 9) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(x + 9) equal to 4.69041576 and -4.69041576.

Subproblem 1

x + 9 = 4.69041576 Simplifying x + 9 = 4.69041576 Reorder the terms: 9 + x = 4.69041576 Solving 9 + x = 4.69041576 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 = 4.69041576 + -9 Combine like terms: 9 + -9 = 0 0 + x = 4.69041576 + -9 x = 4.69041576 + -9 Combine like terms: 4.69041576 + -9 = -4.30958424 x = -4.30958424 Simplifying x = -4.30958424

Subproblem 2

x + 9 = -4.69041576 Simplifying x + 9 = -4.69041576 Reorder the terms: 9 + x = -4.69041576 Solving 9 + x = -4.69041576 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 = -4.69041576 + -9 Combine like terms: 9 + -9 = 0 0 + x = -4.69041576 + -9 x = -4.69041576 + -9 Combine like terms: -4.69041576 + -9 = -13.69041576 x = -13.69041576 Simplifying x = -13.69041576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.30958424, -13.69041576}

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