(x+8)(x-2)=100

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Solution for (x+8)(x-2)=100 equation:


Simplifying
(x + 8)(x + -2) = 100

Reorder the terms:
(8 + x)(x + -2) = 100

Reorder the terms:
(8 + x)(-2 + x) = 100

Multiply (8 + x) * (-2 + x)
(8(-2 + x) + x(-2 + x)) = 100
((-2 * 8 + x * 8) + x(-2 + x)) = 100
((-16 + 8x) + x(-2 + x)) = 100
(-16 + 8x + (-2 * x + x * x)) = 100
(-16 + 8x + (-2x + x2)) = 100

Combine like terms: 8x + -2x = 6x
(-16 + 6x + x2) = 100

Solving
-16 + 6x + x2 = 100

Solving for variable 'x'.

Reorder the terms:
-16 + -100 + 6x + x2 = 100 + -100

Combine like terms: -16 + -100 = -116
-116 + 6x + x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-116 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '116' to each side of the equation.
-116 + 6x + 116 + x2 = 0 + 116

Reorder the terms:
-116 + 116 + 6x + x2 = 0 + 116

Combine like terms: -116 + 116 = 0
0 + 6x + x2 = 0 + 116
6x + x2 = 0 + 116

Combine like terms: 0 + 116 = 116
6x + x2 = 116

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 116 + 9

Reorder the terms:
9 + 6x + x2 = 116 + 9

Combine like terms: 116 + 9 = 125
9 + 6x + x2 = 125

Factor a perfect square on the left side:
(x + 3)(x + 3) = 125

Calculate the square root of the right side: 11.180339887

Break this problem into two subproblems by setting 
(x + 3) equal to 11.180339887 and -11.180339887.

Subproblem 1

x + 3 = 11.180339887 Simplifying x + 3 = 11.180339887 Reorder the terms: 3 + x = 11.180339887 Solving 3 + x = 11.180339887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 11.180339887 + -3 Combine like terms: 3 + -3 = 0 0 + x = 11.180339887 + -3 x = 11.180339887 + -3 Combine like terms: 11.180339887 + -3 = 8.180339887 x = 8.180339887 Simplifying x = 8.180339887

Subproblem 2

x + 3 = -11.180339887 Simplifying x + 3 = -11.180339887 Reorder the terms: 3 + x = -11.180339887 Solving 3 + x = -11.180339887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -11.180339887 + -3 Combine like terms: 3 + -3 = 0 0 + x = -11.180339887 + -3 x = -11.180339887 + -3 Combine like terms: -11.180339887 + -3 = -14.180339887 x = -14.180339887 Simplifying x = -14.180339887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.180339887, -14.180339887}

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