(x+8)(x-4)=8

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


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

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

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

Multiply (8 + x) * (-4 + x)
(8(-4 + x) + x(-4 + x)) = 8
((-4 * 8 + x * 8) + x(-4 + x)) = 8
((-32 + 8x) + x(-4 + x)) = 8
(-32 + 8x + (-4 * x + x * x)) = 8
(-32 + 8x + (-4x + x2)) = 8

Combine like terms: 8x + -4x = 4x
(-32 + 4x + x2) = 8

Solving
-32 + 4x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
-32 + -8 + 4x + x2 = 8 + -8

Combine like terms: -32 + -8 = -40
-40 + 4x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-40 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 4x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + 4x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 4x + x2 = 0 + 40
4x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
4x + x2 = 40

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 = 40 + 4

Reorder the terms:
4 + 4x + x2 = 40 + 4

Combine like terms: 40 + 4 = 44
4 + 4x + x2 = 44

Factor a perfect square on the left side:
(x + 2)(x + 2) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(x + 2) equal to 6.633249581 and -6.633249581.

Subproblem 1

x + 2 = 6.633249581 Simplifying x + 2 = 6.633249581 Reorder the terms: 2 + x = 6.633249581 Solving 2 + x = 6.633249581 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 = 6.633249581 + -2 Combine like terms: 2 + -2 = 0 0 + x = 6.633249581 + -2 x = 6.633249581 + -2 Combine like terms: 6.633249581 + -2 = 4.633249581 x = 4.633249581 Simplifying x = 4.633249581

Subproblem 2

x + 2 = -6.633249581 Simplifying x + 2 = -6.633249581 Reorder the terms: 2 + x = -6.633249581 Solving 2 + x = -6.633249581 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 = -6.633249581 + -2 Combine like terms: 2 + -2 = 0 0 + x = -6.633249581 + -2 x = -6.633249581 + -2 Combine like terms: -6.633249581 + -2 = -8.633249581 x = -8.633249581 Simplifying x = -8.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.633249581, -8.633249581}

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