x(12+x)=2x+8

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


Simplifying
x(12 + x) = 2x + 8
(12 * x + x * x) = 2x + 8
(12x + x2) = 2x + 8

Reorder the terms:
12x + x2 = 8 + 2x

Solving
12x + x2 = 8 + 2x

Solving for variable 'x'.

Reorder the terms:
-8 + 12x + -2x + x2 = 8 + 2x + -8 + -2x

Combine like terms: 12x + -2x = 10x
-8 + 10x + x2 = 8 + 2x + -8 + -2x

Reorder the terms:
-8 + 10x + x2 = 8 + -8 + 2x + -2x

Combine like terms: 8 + -8 = 0
-8 + 10x + x2 = 0 + 2x + -2x
-8 + 10x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-8 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 10x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 10x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 10x + x2 = 0 + 8
10x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
10x + x2 = 8

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 = 8 + 25

Reorder the terms:
25 + 10x + x2 = 8 + 25

Combine like terms: 8 + 25 = 33
25 + 10x + x2 = 33

Factor a perfect square on the left side:
(x + 5)(x + 5) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(x + 5) equal to 5.744562647 and -5.744562647.

Subproblem 1

x + 5 = 5.744562647 Simplifying x + 5 = 5.744562647 Reorder the terms: 5 + x = 5.744562647 Solving 5 + x = 5.744562647 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 = 5.744562647 + -5 Combine like terms: 5 + -5 = 0 0 + x = 5.744562647 + -5 x = 5.744562647 + -5 Combine like terms: 5.744562647 + -5 = 0.744562647 x = 0.744562647 Simplifying x = 0.744562647

Subproblem 2

x + 5 = -5.744562647 Simplifying x + 5 = -5.744562647 Reorder the terms: 5 + x = -5.744562647 Solving 5 + x = -5.744562647 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 = -5.744562647 + -5 Combine like terms: 5 + -5 = 0 0 + x = -5.744562647 + -5 x = -5.744562647 + -5 Combine like terms: -5.744562647 + -5 = -10.744562647 x = -10.744562647 Simplifying x = -10.744562647

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.744562647, -10.744562647}

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