x^2+16x=12

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Solution for x^2+16x=12 equation:


Simplifying
x2 + 16x = 12

Reorder the terms:
16x + x2 = 12

Solving
16x + x2 = 12

Solving for variable 'x'.

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

Combine like terms: 12 + -12 = 0
-12 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 16x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 16x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 16x + x2 = 0 + 12
16x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
16x + x2 = 12

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 12 + 64

Reorder the terms:
64 + 16x + x2 = 12 + 64

Combine like terms: 12 + 64 = 76
64 + 16x + x2 = 76

Factor a perfect square on the left side:
(x + 8)(x + 8) = 76

Calculate the square root of the right side: 8.717797887

Break this problem into two subproblems by setting 
(x + 8) equal to 8.717797887 and -8.717797887.

Subproblem 1

x + 8 = 8.717797887 Simplifying x + 8 = 8.717797887 Reorder the terms: 8 + x = 8.717797887 Solving 8 + x = 8.717797887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 8.717797887 + -8 Combine like terms: 8 + -8 = 0 0 + x = 8.717797887 + -8 x = 8.717797887 + -8 Combine like terms: 8.717797887 + -8 = 0.717797887 x = 0.717797887 Simplifying x = 0.717797887

Subproblem 2

x + 8 = -8.717797887 Simplifying x + 8 = -8.717797887 Reorder the terms: 8 + x = -8.717797887 Solving 8 + x = -8.717797887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -8.717797887 + -8 Combine like terms: 8 + -8 = 0 0 + x = -8.717797887 + -8 x = -8.717797887 + -8 Combine like terms: -8.717797887 + -8 = -16.717797887 x = -16.717797887 Simplifying x = -16.717797887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.717797887, -16.717797887}

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