8x-9=4x(15-2x)

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Solution for 8x-9=4x(15-2x) equation:


Simplifying
8x + -9 = 4x(15 + -2x)

Reorder the terms:
-9 + 8x = 4x(15 + -2x)
-9 + 8x = (15 * 4x + -2x * 4x)
-9 + 8x = (60x + -8x2)

Solving
-9 + 8x = 60x + -8x2

Solving for variable 'x'.

Combine like terms: 8x + -60x = -52x
-9 + -52x + 8x2 = 60x + -8x2 + -60x + 8x2

Reorder the terms:
-9 + -52x + 8x2 = 60x + -60x + -8x2 + 8x2

Combine like terms: 60x + -60x = 0
-9 + -52x + 8x2 = 0 + -8x2 + 8x2
-9 + -52x + 8x2 = -8x2 + 8x2

Combine like terms: -8x2 + 8x2 = 0
-9 + -52x + 8x2 = 0

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

Divide each side by '8'.
-1.125 + -6.5x + x2 = 0

Move the constant term to the right:

Add '1.125' to each side of the equation.
-1.125 + -6.5x + 1.125 + x2 = 0 + 1.125

Reorder the terms:
-1.125 + 1.125 + -6.5x + x2 = 0 + 1.125

Combine like terms: -1.125 + 1.125 = 0.000
0.000 + -6.5x + x2 = 0 + 1.125
-6.5x + x2 = 0 + 1.125

Combine like terms: 0 + 1.125 = 1.125
-6.5x + x2 = 1.125

The x term is -6.5x.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5x + 10.5625 + x2 = 1.125 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 1.125 + 10.5625

Combine like terms: 1.125 + 10.5625 = 11.6875
10.5625 + -6.5x + x2 = 11.6875

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 11.6875

Calculate the square root of the right side: 3.418698583

Break this problem into two subproblems by setting 
(x + -3.25) equal to 3.418698583 and -3.418698583.

Subproblem 1

x + -3.25 = 3.418698583 Simplifying x + -3.25 = 3.418698583 Reorder the terms: -3.25 + x = 3.418698583 Solving -3.25 + x = 3.418698583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = 3.418698583 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 3.418698583 + 3.25 x = 3.418698583 + 3.25 Combine like terms: 3.418698583 + 3.25 = 6.668698583 x = 6.668698583 Simplifying x = 6.668698583

Subproblem 2

x + -3.25 = -3.418698583 Simplifying x + -3.25 = -3.418698583 Reorder the terms: -3.25 + x = -3.418698583 Solving -3.25 + x = -3.418698583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = -3.418698583 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -3.418698583 + 3.25 x = -3.418698583 + 3.25 Combine like terms: -3.418698583 + 3.25 = -0.168698583 x = -0.168698583 Simplifying x = -0.168698583

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.668698583, -0.168698583}

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