x^2+16x=208

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Solution for x^2+16x=208 equation:


Simplifying
x2 + 16x = 208

Reorder the terms:
16x + x2 = 208

Solving
16x + x2 = 208

Solving for variable 'x'.

Reorder the terms:
-208 + 16x + x2 = 208 + -208

Combine like terms: 208 + -208 = 0
-208 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '208' to each side of the equation.
-208 + 16x + 208 + x2 = 0 + 208

Reorder the terms:
-208 + 208 + 16x + x2 = 0 + 208

Combine like terms: -208 + 208 = 0
0 + 16x + x2 = 0 + 208
16x + x2 = 0 + 208

Combine like terms: 0 + 208 = 208
16x + x2 = 208

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 = 208 + 64

Reorder the terms:
64 + 16x + x2 = 208 + 64

Combine like terms: 208 + 64 = 272
64 + 16x + x2 = 272

Factor a perfect square on the left side:
(x + 8)(x + 8) = 272

Calculate the square root of the right side: 16.492422502

Break this problem into two subproblems by setting 
(x + 8) equal to 16.492422502 and -16.492422502.

Subproblem 1

x + 8 = 16.492422502 Simplifying x + 8 = 16.492422502 Reorder the terms: 8 + x = 16.492422502 Solving 8 + x = 16.492422502 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 = 16.492422502 + -8 Combine like terms: 8 + -8 = 0 0 + x = 16.492422502 + -8 x = 16.492422502 + -8 Combine like terms: 16.492422502 + -8 = 8.492422502 x = 8.492422502 Simplifying x = 8.492422502

Subproblem 2

x + 8 = -16.492422502 Simplifying x + 8 = -16.492422502 Reorder the terms: 8 + x = -16.492422502 Solving 8 + x = -16.492422502 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 = -16.492422502 + -8 Combine like terms: 8 + -8 = 0 0 + x = -16.492422502 + -8 x = -16.492422502 + -8 Combine like terms: -16.492422502 + -8 = -24.492422502 x = -24.492422502 Simplifying x = -24.492422502

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.492422502, -24.492422502}

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