(x+2)(x+8)=12

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Solution for (x+2)(x+8)=12 equation:


Simplifying
(x + 2)(x + 8) = 12

Reorder the terms:
(2 + x)(x + 8) = 12

Reorder the terms:
(2 + x)(8 + x) = 12

Multiply (2 + x) * (8 + x)
(2(8 + x) + x(8 + x)) = 12
((8 * 2 + x * 2) + x(8 + x)) = 12
((16 + 2x) + x(8 + x)) = 12
(16 + 2x + (8 * x + x * x)) = 12
(16 + 2x + (8x + x2)) = 12

Combine like terms: 2x + 8x = 10x
(16 + 10x + x2) = 12

Solving
16 + 10x + x2 = 12

Solving for variable 'x'.

Reorder the terms:
16 + -12 + 10x + x2 = 12 + -12

Combine like terms: 16 + -12 = 4
4 + 10x + x2 = 12 + -12

Combine like terms: 12 + -12 = 0
4 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 10x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 10x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 10x + x2 = 0 + -4
10x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
10x + x2 = -4

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = -4 + 25

Reorder the terms:
25 + 10x + x2 = -4 + 25

Combine like terms: -4 + 25 = 21
25 + 10x + x2 = 21

Factor a perfect square on the left side:
(x + 5)(x + 5) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(x + 5) equal to 4.582575695 and -4.582575695.

Subproblem 1

x + 5 = 4.582575695 Simplifying x + 5 = 4.582575695 Reorder the terms: 5 + x = 4.582575695 Solving 5 + x = 4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 4.582575695 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.582575695 + -5 x = 4.582575695 + -5 Combine like terms: 4.582575695 + -5 = -0.417424305 x = -0.417424305 Simplifying x = -0.417424305

Subproblem 2

x + 5 = -4.582575695 Simplifying x + 5 = -4.582575695 Reorder the terms: 5 + x = -4.582575695 Solving 5 + x = -4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -4.582575695 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.582575695 + -5 x = -4.582575695 + -5 Combine like terms: -4.582575695 + -5 = -9.582575695 x = -9.582575695 Simplifying x = -9.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.417424305, -9.582575695}

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