0=x^2+8x-186

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Solution for 0=x^2+8x-186 equation:


Simplifying
0 = x2 + 8x + -186

Reorder the terms:
0 = -186 + 8x + x2

Solving
0 = -186 + 8x + x2

Solving for variable 'x'.

Combine like terms: 0 + 186 = 186
186 + -8x + -1x2 = -186 + 8x + x2 + 186 + -8x + -1x2

Reorder the terms:
186 + -8x + -1x2 = -186 + 186 + 8x + -8x + x2 + -1x2

Combine like terms: -186 + 186 = 0
186 + -8x + -1x2 = 0 + 8x + -8x + x2 + -1x2
186 + -8x + -1x2 = 8x + -8x + x2 + -1x2

Combine like terms: 8x + -8x = 0
186 + -8x + -1x2 = 0 + x2 + -1x2
186 + -8x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
186 + -8x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-186 + 8x + x2 = 0

Move the constant term to the right:

Add '186' to each side of the equation.
-186 + 8x + 186 + x2 = 0 + 186

Reorder the terms:
-186 + 186 + 8x + x2 = 0 + 186

Combine like terms: -186 + 186 = 0
0 + 8x + x2 = 0 + 186
8x + x2 = 0 + 186

Combine like terms: 0 + 186 = 186
8x + x2 = 186

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 = 186 + 16

Reorder the terms:
16 + 8x + x2 = 186 + 16

Combine like terms: 186 + 16 = 202
16 + 8x + x2 = 202

Factor a perfect square on the left side:
(x + 4)(x + 4) = 202

Calculate the square root of the right side: 14.212670404

Break this problem into two subproblems by setting 
(x + 4) equal to 14.212670404 and -14.212670404.

Subproblem 1

x + 4 = 14.212670404 Simplifying x + 4 = 14.212670404 Reorder the terms: 4 + x = 14.212670404 Solving 4 + x = 14.212670404 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 = 14.212670404 + -4 Combine like terms: 4 + -4 = 0 0 + x = 14.212670404 + -4 x = 14.212670404 + -4 Combine like terms: 14.212670404 + -4 = 10.212670404 x = 10.212670404 Simplifying x = 10.212670404

Subproblem 2

x + 4 = -14.212670404 Simplifying x + 4 = -14.212670404 Reorder the terms: 4 + x = -14.212670404 Solving 4 + x = -14.212670404 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 = -14.212670404 + -4 Combine like terms: 4 + -4 = 0 0 + x = -14.212670404 + -4 x = -14.212670404 + -4 Combine like terms: -14.212670404 + -4 = -18.212670404 x = -18.212670404 Simplifying x = -18.212670404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.212670404, -18.212670404}

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