8-X^2=X

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Solution for 8-X^2=X equation:


Simplifying
8 + -1X2 = X

Solving
8 + -1X2 = X

Solving for variable 'X'.

Reorder the terms:
8 + -1X + -1X2 = X + -1X

Combine like terms: X + -1X = 0
8 + -1X + -1X2 = 0

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

Divide each side by '-1'.
-8 + X + X2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + X + 8 + X2 = 0 + 8

Reorder the terms:
-8 + 8 + X + X2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + X + X2 = 0 + 8
X + X2 = 0 + 8

Combine like terms: 0 + 8 = 8
X + X2 = 8

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 = 8 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + X2 = 8 + 0.25

Combine like terms: 8 + 0.25 = 8.25
1.25 + X2 = 8.25

Factor a perfect square on the left side:
(X + 0.5)(X + 0.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(X + 0.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

X + 0.5 = 2.872281323 Simplifying X + 0.5 = 2.872281323 Reorder the terms: 0.5 + X = 2.872281323 Solving 0.5 + X = 2.872281323 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 = 2.872281323 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = 2.872281323 + -0.5 X = 2.872281323 + -0.5 Combine like terms: 2.872281323 + -0.5 = 2.372281323 X = 2.372281323 Simplifying X = 2.372281323

Subproblem 2

X + 0.5 = -2.872281323 Simplifying X + 0.5 = -2.872281323 Reorder the terms: 0.5 + X = -2.872281323 Solving 0.5 + X = -2.872281323 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 = -2.872281323 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = -2.872281323 + -0.5 X = -2.872281323 + -0.5 Combine like terms: -2.872281323 + -0.5 = -3.372281323 X = -3.372281323 Simplifying X = -3.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. X = {2.372281323, -3.372281323}

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