8-x=x^2-8

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


Simplifying
8 + -1x = x2 + -8

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

Solving
8 + -1x = -8 + x2

Solving for variable 'x'.

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

Combine like terms: 8 + 8 = 16
16 + -1x + -1x2 = -8 + x2 + 8 + -1x2

Reorder the terms:
16 + -1x + -1x2 = -8 + 8 + x2 + -1x2

Combine like terms: -8 + 8 = 0
16 + -1x + -1x2 = 0 + x2 + -1x2
16 + -1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
16 + -1x + -1x2 = 0

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

Divide each side by '-1'.
-16 + x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + x + x2 = 0 + 16
x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
x + x2 = 16

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 16 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
1.25 + x2 = 16.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + 0.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x + 0.5 = 4.031128874 Simplifying x + 0.5 = 4.031128874 Reorder the terms: 0.5 + x = 4.031128874 Solving 0.5 + x = 4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 4.031128874 + -0.5 x = 4.031128874 + -0.5 Combine like terms: 4.031128874 + -0.5 = 3.531128874 x = 3.531128874 Simplifying x = 3.531128874

Subproblem 2

x + 0.5 = -4.031128874 Simplifying x + 0.5 = -4.031128874 Reorder the terms: 0.5 + x = -4.031128874 Solving 0.5 + x = -4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -4.031128874 + -0.5 x = -4.031128874 + -0.5 Combine like terms: -4.031128874 + -0.5 = -4.531128874 x = -4.531128874 Simplifying x = -4.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.531128874, -4.531128874}

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