x^2+12x+20=8

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Solution for x^2+12x+20=8 equation:


Simplifying
x2 + 12x + 20 = 8

Reorder the terms:
20 + 12x + x2 = 8

Solving
20 + 12x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
20 + -8 + 12x + x2 = 8 + -8

Combine like terms: 20 + -8 = 12
12 + 12x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
12 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + 12x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + 12x + x2 = 0 + -12

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

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

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = -12 + 36

Reorder the terms:
36 + 12x + x2 = -12 + 36

Combine like terms: -12 + 36 = 24
36 + 12x + x2 = 24

Factor a perfect square on the left side:
(x + 6)(x + 6) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(x + 6) equal to 4.898979486 and -4.898979486.

Subproblem 1

x + 6 = 4.898979486 Simplifying x + 6 = 4.898979486 Reorder the terms: 6 + x = 4.898979486 Solving 6 + x = 4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 4.898979486 + -6 Combine like terms: 6 + -6 = 0 0 + x = 4.898979486 + -6 x = 4.898979486 + -6 Combine like terms: 4.898979486 + -6 = -1.101020514 x = -1.101020514 Simplifying x = -1.101020514

Subproblem 2

x + 6 = -4.898979486 Simplifying x + 6 = -4.898979486 Reorder the terms: 6 + x = -4.898979486 Solving 6 + x = -4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -4.898979486 + -6 Combine like terms: 6 + -6 = 0 0 + x = -4.898979486 + -6 x = -4.898979486 + -6 Combine like terms: -4.898979486 + -6 = -10.898979486 x = -10.898979486 Simplifying x = -10.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.101020514, -10.898979486}

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