6(x+9)=5(5x-8)x

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Solution for 6(x+9)=5(5x-8)x equation:


Simplifying
6(x + 9) = 5(5x + -8) * x

Reorder the terms:
6(9 + x) = 5(5x + -8) * x
(9 * 6 + x * 6) = 5(5x + -8) * x
(54 + 6x) = 5(5x + -8) * x

Reorder the terms:
54 + 6x = 5(-8 + 5x) * x

Reorder the terms for easier multiplication:
54 + 6x = 5x(-8 + 5x)
54 + 6x = (-8 * 5x + 5x * 5x)
54 + 6x = (-40x + 25x2)

Solving
54 + 6x = -40x + 25x2

Solving for variable 'x'.

Combine like terms: 6x + 40x = 46x
54 + 46x + -25x2 = -40x + 25x2 + 40x + -25x2

Reorder the terms:
54 + 46x + -25x2 = -40x + 40x + 25x2 + -25x2

Combine like terms: -40x + 40x = 0
54 + 46x + -25x2 = 0 + 25x2 + -25x2
54 + 46x + -25x2 = 25x2 + -25x2

Combine like terms: 25x2 + -25x2 = 0
54 + 46x + -25x2 = 0

Begin completing the square.  Divide all terms by
-25 the coefficient of the squared term: 

Divide each side by '-25'.
-2.16 + -1.84x + x2 = 0

Move the constant term to the right:

Add '2.16' to each side of the equation.
-2.16 + -1.84x + 2.16 + x2 = 0 + 2.16

Reorder the terms:
-2.16 + 2.16 + -1.84x + x2 = 0 + 2.16

Combine like terms: -2.16 + 2.16 = 0.00
0.00 + -1.84x + x2 = 0 + 2.16
-1.84x + x2 = 0 + 2.16

Combine like terms: 0 + 2.16 = 2.16
-1.84x + x2 = 2.16

The x term is -1.84x.  Take half its coefficient (-0.92).
Square it (0.8464) and add it to both sides.

Add '0.8464' to each side of the equation.
-1.84x + 0.8464 + x2 = 2.16 + 0.8464

Reorder the terms:
0.8464 + -1.84x + x2 = 2.16 + 0.8464

Combine like terms: 2.16 + 0.8464 = 3.0064
0.8464 + -1.84x + x2 = 3.0064

Factor a perfect square on the left side:
(x + -0.92)(x + -0.92) = 3.0064

Calculate the square root of the right side: 1.733897344

Break this problem into two subproblems by setting 
(x + -0.92) equal to 1.733897344 and -1.733897344.

Subproblem 1

x + -0.92 = 1.733897344 Simplifying x + -0.92 = 1.733897344 Reorder the terms: -0.92 + x = 1.733897344 Solving -0.92 + x = 1.733897344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.92' to each side of the equation. -0.92 + 0.92 + x = 1.733897344 + 0.92 Combine like terms: -0.92 + 0.92 = 0.00 0.00 + x = 1.733897344 + 0.92 x = 1.733897344 + 0.92 Combine like terms: 1.733897344 + 0.92 = 2.653897344 x = 2.653897344 Simplifying x = 2.653897344

Subproblem 2

x + -0.92 = -1.733897344 Simplifying x + -0.92 = -1.733897344 Reorder the terms: -0.92 + x = -1.733897344 Solving -0.92 + x = -1.733897344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.92' to each side of the equation. -0.92 + 0.92 + x = -1.733897344 + 0.92 Combine like terms: -0.92 + 0.92 = 0.00 0.00 + x = -1.733897344 + 0.92 x = -1.733897344 + 0.92 Combine like terms: -1.733897344 + 0.92 = -0.813897344 x = -0.813897344 Simplifying x = -0.813897344

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.653897344, -0.813897344}

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