x^2+13x-132=0

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Solution for x^2+13x-132=0 equation:


Simplifying
x2 + 13x + -132 = 0

Reorder the terms:
-132 + 13x + x2 = 0

Solving
-132 + 13x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '132' to each side of the equation.
-132 + 13x + 132 + x2 = 0 + 132

Reorder the terms:
-132 + 132 + 13x + x2 = 0 + 132

Combine like terms: -132 + 132 = 0
0 + 13x + x2 = 0 + 132
13x + x2 = 0 + 132

Combine like terms: 0 + 132 = 132
13x + x2 = 132

The x term is 13x.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13x + 42.25 + x2 = 132 + 42.25

Reorder the terms:
42.25 + 13x + x2 = 132 + 42.25

Combine like terms: 132 + 42.25 = 174.25
42.25 + 13x + x2 = 174.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 174.25

Calculate the square root of the right side: 13.200378782

Break this problem into two subproblems by setting 
(x + 6.5) equal to 13.200378782 and -13.200378782.

Subproblem 1

x + 6.5 = 13.200378782 Simplifying x + 6.5 = 13.200378782 Reorder the terms: 6.5 + x = 13.200378782 Solving 6.5 + x = 13.200378782 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = 13.200378782 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 13.200378782 + -6.5 x = 13.200378782 + -6.5 Combine like terms: 13.200378782 + -6.5 = 6.700378782 x = 6.700378782 Simplifying x = 6.700378782

Subproblem 2

x + 6.5 = -13.200378782 Simplifying x + 6.5 = -13.200378782 Reorder the terms: 6.5 + x = -13.200378782 Solving 6.5 + x = -13.200378782 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = -13.200378782 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -13.200378782 + -6.5 x = -13.200378782 + -6.5 Combine like terms: -13.200378782 + -6.5 = -19.700378782 x = -19.700378782 Simplifying x = -19.700378782

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.700378782, -19.700378782}

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