x^2-8x=9x-12

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Solution for x^2-8x=9x-12 equation:


Simplifying
x2 + -8x = 9x + -12

Reorder the terms:
-8x + x2 = 9x + -12

Reorder the terms:
-8x + x2 = -12 + 9x

Solving
-8x + x2 = -12 + 9x

Solving for variable 'x'.

Reorder the terms:
12 + -8x + -9x + x2 = -12 + 9x + 12 + -9x

Combine like terms: -8x + -9x = -17x
12 + -17x + x2 = -12 + 9x + 12 + -9x

Reorder the terms:
12 + -17x + x2 = -12 + 12 + 9x + -9x

Combine like terms: -12 + 12 = 0
12 + -17x + x2 = 0 + 9x + -9x
12 + -17x + x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
12 + -17x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -17x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + -17x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -17x + x2 = 0 + -12
-17x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
-17x + x2 = -12

The x term is -17x.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17x + 72.25 + x2 = -12 + 72.25

Reorder the terms:
72.25 + -17x + x2 = -12 + 72.25

Combine like terms: -12 + 72.25 = 60.25
72.25 + -17x + x2 = 60.25

Factor a perfect square on the left side:
(x + -8.5)(x + -8.5) = 60.25

Calculate the square root of the right side: 7.762087348

Break this problem into two subproblems by setting 
(x + -8.5) equal to 7.762087348 and -7.762087348.

Subproblem 1

x + -8.5 = 7.762087348 Simplifying x + -8.5 = 7.762087348 Reorder the terms: -8.5 + x = 7.762087348 Solving -8.5 + x = 7.762087348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = 7.762087348 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = 7.762087348 + 8.5 x = 7.762087348 + 8.5 Combine like terms: 7.762087348 + 8.5 = 16.262087348 x = 16.262087348 Simplifying x = 16.262087348

Subproblem 2

x + -8.5 = -7.762087348 Simplifying x + -8.5 = -7.762087348 Reorder the terms: -8.5 + x = -7.762087348 Solving -8.5 + x = -7.762087348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = -7.762087348 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = -7.762087348 + 8.5 x = -7.762087348 + 8.5 Combine like terms: -7.762087348 + 8.5 = 0.737912652 x = 0.737912652 Simplifying x = 0.737912652

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.262087348, 0.737912652}

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