x^2+8x=8

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


Simplifying
x2 + 8x = 8

Reorder the terms:
8x + x2 = 8

Solving
8x + x2 = 8

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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 = 8 + 16

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

Combine like terms: 8 + 16 = 24
16 + 8x + x2 = 24

Factor a perfect square on the left side:
(x + 4)(x + 4) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(x + 4) equal to 4.898979486 and -4.898979486.

Subproblem 1

x + 4 = 4.898979486 Simplifying x + 4 = 4.898979486 Reorder the terms: 4 + x = 4.898979486 Solving 4 + x = 4.898979486 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 = 4.898979486 + -4 Combine like terms: 4 + -4 = 0 0 + x = 4.898979486 + -4 x = 4.898979486 + -4 Combine like terms: 4.898979486 + -4 = 0.898979486 x = 0.898979486 Simplifying x = 0.898979486

Subproblem 2

x + 4 = -4.898979486 Simplifying x + 4 = -4.898979486 Reorder the terms: 4 + x = -4.898979486 Solving 4 + x = -4.898979486 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 = -4.898979486 + -4 Combine like terms: 4 + -4 = 0 0 + x = -4.898979486 + -4 x = -4.898979486 + -4 Combine like terms: -4.898979486 + -4 = -8.898979486 x = -8.898979486 Simplifying x = -8.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.898979486, -8.898979486}

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