x^2-8x=23

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Solution for x^2-8x=23 equation: 


Simplifying
x2 + -8x = 23

Reorder the terms:
-8x + x2 = 23

Solving
-8x + x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + -8x + x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + -8x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + -8x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + -8x + x2 = 0 + 23
-8x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
-8x + x2 = 23

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 = 23 + 16

Reorder the terms:
16 + -8x + x2 = 23 + 16

Combine like terms: 23 + 16 = 39
16 + -8x + x2 = 39

Factor a perfect square on the left side:
(x + -4)(x + -4) = 39

Calculate the square root of the right side: 6.244997998

Break this problem into two subproblems by setting 
(x + -4) equal to 6.244997998 and -6.244997998.


Subproblem 1
x + -4 = 6.244997998

Simplifying
x + -4 = 6.244997998

Reorder the terms:
-4 + x = 6.244997998

Solving
-4 + x = 6.244997998

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 = 6.244997998 + 4

Combine like terms: -4 + 4 = 0
0 + x = 6.244997998 + 4
x = 6.244997998 + 4

Combine like terms: 6.244997998 + 4 = 10.244997998
x = 10.244997998

Simplifying
x = 10.244997998


Subproblem 2
x + -4 = -6.244997998

Simplifying
x + -4 = -6.244997998

Reorder the terms:
-4 + x = -6.244997998

Solving
-4 + x = -6.244997998

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 = -6.244997998 + 4

Combine like terms: -4 + 4 = 0
0 + x = -6.244997998 + 4
x = -6.244997998 + 4

Combine like terms: -6.244997998 + 4 = -2.244997998
x = -2.244997998

Simplifying
x = -2.244997998


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {10.244997998, -2.244997998}

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