x^2+8x-82=6

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Solution for x^2+8x-82=6 equation:


Simplifying
x2 + 8x + -82 = 6

Reorder the terms:
-82 + 8x + x2 = 6

Solving
-82 + 8x + x2 = 6

Solving for variable 'x'.

Reorder the terms:
-82 + -6 + 8x + x2 = 6 + -6

Combine like terms: -82 + -6 = -88
-88 + 8x + x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-88 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + 8x + 88 + x2 = 0 + 88

Reorder the terms:
-88 + 88 + 8x + x2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + 8x + x2 = 0 + 88
8x + x2 = 0 + 88

Combine like terms: 0 + 88 = 88
8x + x2 = 88

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 = 88 + 16

Reorder the terms:
16 + 8x + x2 = 88 + 16

Combine like terms: 88 + 16 = 104
16 + 8x + x2 = 104

Factor a perfect square on the left side:
(x + 4)(x + 4) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(x + 4) equal to 10.198039027 and -10.198039027.

Subproblem 1

x + 4 = 10.198039027 Simplifying x + 4 = 10.198039027 Reorder the terms: 4 + x = 10.198039027 Solving 4 + x = 10.198039027 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 = 10.198039027 + -4 Combine like terms: 4 + -4 = 0 0 + x = 10.198039027 + -4 x = 10.198039027 + -4 Combine like terms: 10.198039027 + -4 = 6.198039027 x = 6.198039027 Simplifying x = 6.198039027

Subproblem 2

x + 4 = -10.198039027 Simplifying x + 4 = -10.198039027 Reorder the terms: 4 + x = -10.198039027 Solving 4 + x = -10.198039027 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 = -10.198039027 + -4 Combine like terms: 4 + -4 = 0 0 + x = -10.198039027 + -4 x = -10.198039027 + -4 Combine like terms: -10.198039027 + -4 = -14.198039027 x = -14.198039027 Simplifying x = -14.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.198039027, -14.198039027}

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