x^2+8x-122=0

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Solution for x^2+8x-122=0 equation:


Simplifying
x2 + 8x + -122 = 0

Reorder the terms:
-122 + 8x + x2 = 0

Solving
-122 + 8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '122' to each side of the equation.
-122 + 8x + 122 + x2 = 0 + 122

Reorder the terms:
-122 + 122 + 8x + x2 = 0 + 122

Combine like terms: -122 + 122 = 0
0 + 8x + x2 = 0 + 122
8x + x2 = 0 + 122

Combine like terms: 0 + 122 = 122
8x + x2 = 122

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 = 122 + 16

Reorder the terms:
16 + 8x + x2 = 122 + 16

Combine like terms: 122 + 16 = 138
16 + 8x + x2 = 138

Factor a perfect square on the left side:
(x + 4)(x + 4) = 138

Calculate the square root of the right side: 11.747340124

Break this problem into two subproblems by setting 
(x + 4) equal to 11.747340124 and -11.747340124.

Subproblem 1

x + 4 = 11.747340124 Simplifying x + 4 = 11.747340124 Reorder the terms: 4 + x = 11.747340124 Solving 4 + x = 11.747340124 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 = 11.747340124 + -4 Combine like terms: 4 + -4 = 0 0 + x = 11.747340124 + -4 x = 11.747340124 + -4 Combine like terms: 11.747340124 + -4 = 7.747340124 x = 7.747340124 Simplifying x = 7.747340124

Subproblem 2

x + 4 = -11.747340124 Simplifying x + 4 = -11.747340124 Reorder the terms: 4 + x = -11.747340124 Solving 4 + x = -11.747340124 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 = -11.747340124 + -4 Combine like terms: 4 + -4 = 0 0 + x = -11.747340124 + -4 x = -11.747340124 + -4 Combine like terms: -11.747340124 + -4 = -15.747340124 x = -15.747340124 Simplifying x = -15.747340124

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.747340124, -15.747340124}

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