x^2+18x-106=0

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Solution for x^2+18x-106=0 equation:


Simplifying
x2 + 18x + -106 = 0

Reorder the terms:
-106 + 18x + x2 = 0

Solving
-106 + 18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '106' to each side of the equation.
-106 + 18x + 106 + x2 = 0 + 106

Reorder the terms:
-106 + 106 + 18x + x2 = 0 + 106

Combine like terms: -106 + 106 = 0
0 + 18x + x2 = 0 + 106
18x + x2 = 0 + 106

Combine like terms: 0 + 106 = 106
18x + x2 = 106

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 = 106 + 81

Reorder the terms:
81 + 18x + x2 = 106 + 81

Combine like terms: 106 + 81 = 187
81 + 18x + x2 = 187

Factor a perfect square on the left side:
(x + 9)(x + 9) = 187

Calculate the square root of the right side: 13.674794331

Break this problem into two subproblems by setting 
(x + 9) equal to 13.674794331 and -13.674794331.

Subproblem 1

x + 9 = 13.674794331 Simplifying x + 9 = 13.674794331 Reorder the terms: 9 + x = 13.674794331 Solving 9 + x = 13.674794331 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 = 13.674794331 + -9 Combine like terms: 9 + -9 = 0 0 + x = 13.674794331 + -9 x = 13.674794331 + -9 Combine like terms: 13.674794331 + -9 = 4.674794331 x = 4.674794331 Simplifying x = 4.674794331

Subproblem 2

x + 9 = -13.674794331 Simplifying x + 9 = -13.674794331 Reorder the terms: 9 + x = -13.674794331 Solving 9 + x = -13.674794331 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 = -13.674794331 + -9 Combine like terms: 9 + -9 = 0 0 + x = -13.674794331 + -9 x = -13.674794331 + -9 Combine like terms: -13.674794331 + -9 = -22.674794331 x = -22.674794331 Simplifying x = -22.674794331

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.674794331, -22.674794331}

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