x^2+8x-168=0

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Solution for x^2+8x-168=0 equation:


Simplifying
x2 + 8x + -168 = 0

Reorder the terms:
-168 + 8x + x2 = 0

Solving
-168 + 8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '168' to each side of the equation.
-168 + 8x + 168 + x2 = 0 + 168

Reorder the terms:
-168 + 168 + 8x + x2 = 0 + 168

Combine like terms: -168 + 168 = 0
0 + 8x + x2 = 0 + 168
8x + x2 = 0 + 168

Combine like terms: 0 + 168 = 168
8x + x2 = 168

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 = 168 + 16

Reorder the terms:
16 + 8x + x2 = 168 + 16

Combine like terms: 168 + 16 = 184
16 + 8x + x2 = 184

Factor a perfect square on the left side:
(x + 4)(x + 4) = 184

Calculate the square root of the right side: 13.564659966

Break this problem into two subproblems by setting 
(x + 4) equal to 13.564659966 and -13.564659966.

Subproblem 1

x + 4 = 13.564659966 Simplifying x + 4 = 13.564659966 Reorder the terms: 4 + x = 13.564659966 Solving 4 + x = 13.564659966 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 = 13.564659966 + -4 Combine like terms: 4 + -4 = 0 0 + x = 13.564659966 + -4 x = 13.564659966 + -4 Combine like terms: 13.564659966 + -4 = 9.564659966 x = 9.564659966 Simplifying x = 9.564659966

Subproblem 2

x + 4 = -13.564659966 Simplifying x + 4 = -13.564659966 Reorder the terms: 4 + x = -13.564659966 Solving 4 + x = -13.564659966 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 = -13.564659966 + -4 Combine like terms: 4 + -4 = 0 0 + x = -13.564659966 + -4 x = -13.564659966 + -4 Combine like terms: -13.564659966 + -4 = -17.564659966 x = -17.564659966 Simplifying x = -17.564659966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.564659966, -17.564659966}

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