x^2+16x=-6

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Solution for x^2+16x=-6 equation:


Simplifying
x2 + 16x = -6

Reorder the terms:
16x + x2 = -6

Solving
16x + x2 = -6

Solving for variable 'x'.

Reorder the terms:
6 + 16x + x2 = -6 + 6

Combine like terms: -6 + 6 = 0
6 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + 16x + -6 + x2 = 0 + -6

Reorder the terms:
6 + -6 + 16x + x2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 16x + x2 = 0 + -6
16x + x2 = 0 + -6

Combine like terms: 0 + -6 = -6
16x + x2 = -6

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 = -6 + 64

Reorder the terms:
64 + 16x + x2 = -6 + 64

Combine like terms: -6 + 64 = 58
64 + 16x + x2 = 58

Factor a perfect square on the left side:
(x + 8)(x + 8) = 58

Calculate the square root of the right side: 7.615773106

Break this problem into two subproblems by setting 
(x + 8) equal to 7.615773106 and -7.615773106.

Subproblem 1

x + 8 = 7.615773106 Simplifying x + 8 = 7.615773106 Reorder the terms: 8 + x = 7.615773106 Solving 8 + x = 7.615773106 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 = 7.615773106 + -8 Combine like terms: 8 + -8 = 0 0 + x = 7.615773106 + -8 x = 7.615773106 + -8 Combine like terms: 7.615773106 + -8 = -0.384226894 x = -0.384226894 Simplifying x = -0.384226894

Subproblem 2

x + 8 = -7.615773106 Simplifying x + 8 = -7.615773106 Reorder the terms: 8 + x = -7.615773106 Solving 8 + x = -7.615773106 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 = -7.615773106 + -8 Combine like terms: 8 + -8 = 0 0 + x = -7.615773106 + -8 x = -7.615773106 + -8 Combine like terms: -7.615773106 + -8 = -15.615773106 x = -15.615773106 Simplifying x = -15.615773106

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.384226894, -15.615773106}

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