-x^2-12x+88=0

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Solution for -x^2-12x+88=0 equation:


Simplifying
-1x2 + -12x + 88 = 0

Reorder the terms:
88 + -12x + -1x2 = 0

Solving
88 + -12x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-88 + 12x + x2 = 0

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + 12x + 88 + x2 = 0 + 88

Reorder the terms:
-88 + 88 + 12x + x2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + 12x + x2 = 0 + 88
12x + x2 = 0 + 88

Combine like terms: 0 + 88 = 88
12x + x2 = 88

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 88 + 36

Reorder the terms:
36 + 12x + x2 = 88 + 36

Combine like terms: 88 + 36 = 124
36 + 12x + x2 = 124

Factor a perfect square on the left side:
(x + 6)(x + 6) = 124

Calculate the square root of the right side: 11.135528726

Break this problem into two subproblems by setting 
(x + 6) equal to 11.135528726 and -11.135528726.

Subproblem 1

x + 6 = 11.135528726 Simplifying x + 6 = 11.135528726 Reorder the terms: 6 + x = 11.135528726 Solving 6 + x = 11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 11.135528726 + -6 Combine like terms: 6 + -6 = 0 0 + x = 11.135528726 + -6 x = 11.135528726 + -6 Combine like terms: 11.135528726 + -6 = 5.135528726 x = 5.135528726 Simplifying x = 5.135528726

Subproblem 2

x + 6 = -11.135528726 Simplifying x + 6 = -11.135528726 Reorder the terms: 6 + x = -11.135528726 Solving 6 + x = -11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -11.135528726 + -6 Combine like terms: 6 + -6 = 0 0 + x = -11.135528726 + -6 x = -11.135528726 + -6 Combine like terms: -11.135528726 + -6 = -17.135528726 x = -17.135528726 Simplifying x = -17.135528726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.135528726, -17.135528726}

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