x^2+16x=-46

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Solution for x^2+16x=-46 equation:


Simplifying
x2 + 16x = -46

Reorder the terms:
16x + x2 = -46

Solving
16x + x2 = -46

Solving for variable 'x'.

Reorder the terms:
46 + 16x + x2 = -46 + 46

Combine like terms: -46 + 46 = 0
46 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-46' to each side of the equation.
46 + 16x + -46 + x2 = 0 + -46

Reorder the terms:
46 + -46 + 16x + x2 = 0 + -46

Combine like terms: 46 + -46 = 0
0 + 16x + x2 = 0 + -46
16x + x2 = 0 + -46

Combine like terms: 0 + -46 = -46
16x + x2 = -46

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 = -46 + 64

Reorder the terms:
64 + 16x + x2 = -46 + 64

Combine like terms: -46 + 64 = 18
64 + 16x + x2 = 18

Factor a perfect square on the left side:
(x + 8)(x + 8) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(x + 8) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + 8 = 4.242640687 Simplifying x + 8 = 4.242640687 Reorder the terms: 8 + x = 4.242640687 Solving 8 + x = 4.242640687 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 = 4.242640687 + -8 Combine like terms: 8 + -8 = 0 0 + x = 4.242640687 + -8 x = 4.242640687 + -8 Combine like terms: 4.242640687 + -8 = -3.757359313 x = -3.757359313 Simplifying x = -3.757359313

Subproblem 2

x + 8 = -4.242640687 Simplifying x + 8 = -4.242640687 Reorder the terms: 8 + x = -4.242640687 Solving 8 + x = -4.242640687 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 = -4.242640687 + -8 Combine like terms: 8 + -8 = 0 0 + x = -4.242640687 + -8 x = -4.242640687 + -8 Combine like terms: -4.242640687 + -8 = -12.242640687 x = -12.242640687 Simplifying x = -12.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.757359313, -12.242640687}

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