x^2-5x=8x-3

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Solution for x^2-5x=8x-3 equation:


Simplifying
x2 + -5x = 8x + -3

Reorder the terms:
-5x + x2 = 8x + -3

Reorder the terms:
-5x + x2 = -3 + 8x

Solving
-5x + x2 = -3 + 8x

Solving for variable 'x'.

Reorder the terms:
3 + -5x + -8x + x2 = -3 + 8x + 3 + -8x

Combine like terms: -5x + -8x = -13x
3 + -13x + x2 = -3 + 8x + 3 + -8x

Reorder the terms:
3 + -13x + x2 = -3 + 3 + 8x + -8x

Combine like terms: -3 + 3 = 0
3 + -13x + x2 = 0 + 8x + -8x
3 + -13x + x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
3 + -13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -13x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + -13x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -13x + x2 = 0 + -3
-13x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
-13x + x2 = -3

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 = -3 + 42.25

Reorder the terms:
42.25 + -13x + x2 = -3 + 42.25

Combine like terms: -3 + 42.25 = 39.25
42.25 + -13x + x2 = 39.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 39.25

Calculate the square root of the right side: 6.264982043

Break this problem into two subproblems by setting 
(x + -6.5) equal to 6.264982043 and -6.264982043.

Subproblem 1

x + -6.5 = 6.264982043 Simplifying x + -6.5 = 6.264982043 Reorder the terms: -6.5 + x = 6.264982043 Solving -6.5 + x = 6.264982043 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 = 6.264982043 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 6.264982043 + 6.5 x = 6.264982043 + 6.5 Combine like terms: 6.264982043 + 6.5 = 12.764982043 x = 12.764982043 Simplifying x = 12.764982043

Subproblem 2

x + -6.5 = -6.264982043 Simplifying x + -6.5 = -6.264982043 Reorder the terms: -6.5 + x = -6.264982043 Solving -6.5 + x = -6.264982043 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 = -6.264982043 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -6.264982043 + 6.5 x = -6.264982043 + 6.5 Combine like terms: -6.264982043 + 6.5 = 0.235017957 x = 0.235017957 Simplifying x = 0.235017957

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.764982043, 0.235017957}

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