(x+4)x-8=112

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Solution for (x+4)x-8=112 equation:


Simplifying
(x + 4) * x + -8 = 112

Reorder the terms:
(4 + x) * x + -8 = 112

Reorder the terms for easier multiplication:
x(4 + x) + -8 = 112
(4 * x + x * x) + -8 = 112
(4x + x2) + -8 = 112

Reorder the terms:
-8 + 4x + x2 = 112

Solving
-8 + 4x + x2 = 112

Solving for variable 'x'.

Reorder the terms:
-8 + -112 + 4x + x2 = 112 + -112

Combine like terms: -8 + -112 = -120
-120 + 4x + x2 = 112 + -112

Combine like terms: 112 + -112 = 0
-120 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + 4x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + 4x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 4x + x2 = 0 + 120
4x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
4x + x2 = 120

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 120 + 4

Reorder the terms:
4 + 4x + x2 = 120 + 4

Combine like terms: 120 + 4 = 124
4 + 4x + x2 = 124

Factor a perfect square on the left side:
(x + 2)(x + 2) = 124

Calculate the square root of the right side: 11.135528726

Break this problem into two subproblems by setting 
(x + 2) equal to 11.135528726 and -11.135528726.

Subproblem 1

x + 2 = 11.135528726 Simplifying x + 2 = 11.135528726 Reorder the terms: 2 + x = 11.135528726 Solving 2 + x = 11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 11.135528726 + -2 Combine like terms: 2 + -2 = 0 0 + x = 11.135528726 + -2 x = 11.135528726 + -2 Combine like terms: 11.135528726 + -2 = 9.135528726 x = 9.135528726 Simplifying x = 9.135528726

Subproblem 2

x + 2 = -11.135528726 Simplifying x + 2 = -11.135528726 Reorder the terms: 2 + x = -11.135528726 Solving 2 + x = -11.135528726 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -11.135528726 + -2 Combine like terms: 2 + -2 = 0 0 + x = -11.135528726 + -2 x = -11.135528726 + -2 Combine like terms: -11.135528726 + -2 = -13.135528726 x = -13.135528726 Simplifying x = -13.135528726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.135528726, -13.135528726}

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