x^2-8x=5x-5

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Solution for x^2-8x=5x-5 equation:


Simplifying
x2 + -8x = 5x + -5

Reorder the terms:
-8x + x2 = 5x + -5

Reorder the terms:
-8x + x2 = -5 + 5x

Solving
-8x + x2 = -5 + 5x

Solving for variable 'x'.

Reorder the terms:
5 + -8x + -5x + x2 = -5 + 5x + 5 + -5x

Combine like terms: -8x + -5x = -13x
5 + -13x + x2 = -5 + 5x + 5 + -5x

Reorder the terms:
5 + -13x + x2 = -5 + 5 + 5x + -5x

Combine like terms: -5 + 5 = 0
5 + -13x + x2 = 0 + 5x + -5x
5 + -13x + x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
5 + -13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -13x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + -13x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -13x + x2 = 0 + -5
-13x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-13x + x2 = -5

The x term is -13x.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13x + 42.25 + x2 = -5 + 42.25

Reorder the terms:
42.25 + -13x + x2 = -5 + 42.25

Combine like terms: -5 + 42.25 = 37.25
42.25 + -13x + x2 = 37.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 37.25

Calculate the square root of the right side: 6.103277808

Break this problem into two subproblems by setting 
(x + -6.5) equal to 6.103277808 and -6.103277808.

Subproblem 1

x + -6.5 = 6.103277808 Simplifying x + -6.5 = 6.103277808 Reorder the terms: -6.5 + x = 6.103277808 Solving -6.5 + x = 6.103277808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 6.103277808 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 6.103277808 + 6.5 x = 6.103277808 + 6.5 Combine like terms: 6.103277808 + 6.5 = 12.603277808 x = 12.603277808 Simplifying x = 12.603277808

Subproblem 2

x + -6.5 = -6.103277808 Simplifying x + -6.5 = -6.103277808 Reorder the terms: -6.5 + x = -6.103277808 Solving -6.5 + x = -6.103277808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -6.103277808 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -6.103277808 + 6.5 x = -6.103277808 + 6.5 Combine like terms: -6.103277808 + 6.5 = 0.396722192 x = 0.396722192 Simplifying x = 0.396722192

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.603277808, 0.396722192}

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