x^2+8x=137

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Solution for x^2+8x=137 equation:


Simplifying
x2 + 8x = 137

Reorder the terms:
8x + x2 = 137

Solving
8x + x2 = 137

Solving for variable 'x'.

Reorder the terms:
-137 + 8x + x2 = 137 + -137

Combine like terms: 137 + -137 = 0
-137 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '137' to each side of the equation.
-137 + 8x + 137 + x2 = 0 + 137

Reorder the terms:
-137 + 137 + 8x + x2 = 0 + 137

Combine like terms: -137 + 137 = 0
0 + 8x + x2 = 0 + 137
8x + x2 = 0 + 137

Combine like terms: 0 + 137 = 137
8x + x2 = 137

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 137 + 16

Reorder the terms:
16 + 8x + x2 = 137 + 16

Combine like terms: 137 + 16 = 153
16 + 8x + x2 = 153

Factor a perfect square on the left side:
(x + 4)(x + 4) = 153

Calculate the square root of the right side: 12.369316877

Break this problem into two subproblems by setting 
(x + 4) equal to 12.369316877 and -12.369316877.

Subproblem 1

x + 4 = 12.369316877 Simplifying x + 4 = 12.369316877 Reorder the terms: 4 + x = 12.369316877 Solving 4 + x = 12.369316877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 12.369316877 + -4 Combine like terms: 4 + -4 = 0 0 + x = 12.369316877 + -4 x = 12.369316877 + -4 Combine like terms: 12.369316877 + -4 = 8.369316877 x = 8.369316877 Simplifying x = 8.369316877

Subproblem 2

x + 4 = -12.369316877 Simplifying x + 4 = -12.369316877 Reorder the terms: 4 + x = -12.369316877 Solving 4 + x = -12.369316877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -12.369316877 + -4 Combine like terms: 4 + -4 = 0 0 + x = -12.369316877 + -4 x = -12.369316877 + -4 Combine like terms: -12.369316877 + -4 = -16.369316877 x = -16.369316877 Simplifying x = -16.369316877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.369316877, -16.369316877}

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