x^2+18x=-61

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Solution for x^2+18x=-61 equation:


Simplifying
x2 + 18x = -61

Reorder the terms:
18x + x2 = -61

Solving
18x + x2 = -61

Solving for variable 'x'.

Reorder the terms:
61 + 18x + x2 = -61 + 61

Combine like terms: -61 + 61 = 0
61 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-61' to each side of the equation.
61 + 18x + -61 + x2 = 0 + -61

Reorder the terms:
61 + -61 + 18x + x2 = 0 + -61

Combine like terms: 61 + -61 = 0
0 + 18x + x2 = 0 + -61
18x + x2 = 0 + -61

Combine like terms: 0 + -61 = -61
18x + x2 = -61

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 = -61 + 81

Reorder the terms:
81 + 18x + x2 = -61 + 81

Combine like terms: -61 + 81 = 20
81 + 18x + x2 = 20

Factor a perfect square on the left side:
(x + 9)(x + 9) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + 9) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + 9 = 4.472135955 Simplifying x + 9 = 4.472135955 Reorder the terms: 9 + x = 4.472135955 Solving 9 + x = 4.472135955 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 = 4.472135955 + -9 Combine like terms: 9 + -9 = 0 0 + x = 4.472135955 + -9 x = 4.472135955 + -9 Combine like terms: 4.472135955 + -9 = -4.527864045 x = -4.527864045 Simplifying x = -4.527864045

Subproblem 2

x + 9 = -4.472135955 Simplifying x + 9 = -4.472135955 Reorder the terms: 9 + x = -4.472135955 Solving 9 + x = -4.472135955 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 = -4.472135955 + -9 Combine like terms: 9 + -9 = 0 0 + x = -4.472135955 + -9 x = -4.472135955 + -9 Combine like terms: -4.472135955 + -9 = -13.472135955 x = -13.472135955 Simplifying x = -13.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.527864045, -13.472135955}

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