-8x-9=-8x(x-9)

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Solution for -8x-9=-8x(x-9) equation:


Simplifying
-8x + -9 = -8x(x + -9)

Reorder the terms:
-9 + -8x = -8x(x + -9)

Reorder the terms:
-9 + -8x = -8x(-9 + x)
-9 + -8x = (-9 * -8x + x * -8x)
-9 + -8x = (72x + -8x2)

Solving
-9 + -8x = 72x + -8x2

Solving for variable 'x'.

Combine like terms: -8x + -72x = -80x
-9 + -80x + 8x2 = 72x + -8x2 + -72x + 8x2

Reorder the terms:
-9 + -80x + 8x2 = 72x + -72x + -8x2 + 8x2

Combine like terms: 72x + -72x = 0
-9 + -80x + 8x2 = 0 + -8x2 + 8x2
-9 + -80x + 8x2 = -8x2 + 8x2

Combine like terms: -8x2 + 8x2 = 0
-9 + -80x + 8x2 = 0

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

Divide each side by '8'.
-1.125 + -10x + x2 = 0

Move the constant term to the right:

Add '1.125' to each side of the equation.
-1.125 + -10x + 1.125 + x2 = 0 + 1.125

Reorder the terms:
-1.125 + 1.125 + -10x + x2 = 0 + 1.125

Combine like terms: -1.125 + 1.125 = 0.000
0.000 + -10x + x2 = 0 + 1.125
-10x + x2 = 0 + 1.125

Combine like terms: 0 + 1.125 = 1.125
-10x + x2 = 1.125

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 1.125 + 25

Reorder the terms:
25 + -10x + x2 = 1.125 + 25

Combine like terms: 1.125 + 25 = 26.125
25 + -10x + x2 = 26.125

Factor a perfect square on the left side:
(x + -5)(x + -5) = 26.125

Calculate the square root of the right side: 5.111262075

Break this problem into two subproblems by setting 
(x + -5) equal to 5.111262075 and -5.111262075.

Subproblem 1

x + -5 = 5.111262075 Simplifying x + -5 = 5.111262075 Reorder the terms: -5 + x = 5.111262075 Solving -5 + x = 5.111262075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.111262075 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.111262075 + 5 x = 5.111262075 + 5 Combine like terms: 5.111262075 + 5 = 10.111262075 x = 10.111262075 Simplifying x = 10.111262075

Subproblem 2

x + -5 = -5.111262075 Simplifying x + -5 = -5.111262075 Reorder the terms: -5 + x = -5.111262075 Solving -5 + x = -5.111262075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.111262075 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.111262075 + 5 x = -5.111262075 + 5 Combine like terms: -5.111262075 + 5 = -0.111262075 x = -0.111262075 Simplifying x = -0.111262075

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.111262075, -0.111262075}

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