9x(3x-4)=-(x-8)

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Solution for 9x(3x-4)=-(x-8) equation:


Simplifying
9x(3x + -4) = -1(x + -8)

Reorder the terms:
9x(-4 + 3x) = -1(x + -8)
(-4 * 9x + 3x * 9x) = -1(x + -8)
(-36x + 27x2) = -1(x + -8)

Reorder the terms:
-36x + 27x2 = -1(-8 + x)
-36x + 27x2 = (-8 * -1 + x * -1)
-36x + 27x2 = (8 + -1x)

Solving
-36x + 27x2 = 8 + -1x

Solving for variable 'x'.

Reorder the terms:
-8 + -36x + x + 27x2 = 8 + -1x + -8 + x

Combine like terms: -36x + x = -35x
-8 + -35x + 27x2 = 8 + -1x + -8 + x

Reorder the terms:
-8 + -35x + 27x2 = 8 + -8 + -1x + x

Combine like terms: 8 + -8 = 0
-8 + -35x + 27x2 = 0 + -1x + x
-8 + -35x + 27x2 = -1x + x

Combine like terms: -1x + x = 0
-8 + -35x + 27x2 = 0

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

Divide each side by '27'.
-0.2962962963 + -1.296296296x + x2 = 0

Move the constant term to the right:

Add '0.2962962963' to each side of the equation.
-0.2962962963 + -1.296296296x + 0.2962962963 + x2 = 0 + 0.2962962963

Reorder the terms:
-0.2962962963 + 0.2962962963 + -1.296296296x + x2 = 0 + 0.2962962963

Combine like terms: -0.2962962963 + 0.2962962963 = 0.0000000000
0.0000000000 + -1.296296296x + x2 = 0 + 0.2962962963
-1.296296296x + x2 = 0 + 0.2962962963

Combine like terms: 0 + 0.2962962963 = 0.2962962963
-1.296296296x + x2 = 0.2962962963

The x term is -1.296296296x.  Take half its coefficient (-0.648148148).
Square it (0.4200960218) and add it to both sides.

Add '0.4200960218' to each side of the equation.
-1.296296296x + 0.4200960218 + x2 = 0.2962962963 + 0.4200960218

Reorder the terms:
0.4200960218 + -1.296296296x + x2 = 0.2962962963 + 0.4200960218

Combine like terms: 0.2962962963 + 0.4200960218 = 0.7163923181
0.4200960218 + -1.296296296x + x2 = 0.7163923181

Factor a perfect square on the left side:
(x + -0.648148148)(x + -0.648148148) = 0.7163923181

Calculate the square root of the right side: 0.846399621

Break this problem into two subproblems by setting 
(x + -0.648148148) equal to 0.846399621 and -0.846399621.

Subproblem 1

x + -0.648148148 = 0.846399621 Simplifying x + -0.648148148 = 0.846399621 Reorder the terms: -0.648148148 + x = 0.846399621 Solving -0.648148148 + x = 0.846399621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.648148148' to each side of the equation. -0.648148148 + 0.648148148 + x = 0.846399621 + 0.648148148 Combine like terms: -0.648148148 + 0.648148148 = 0.000000000 0.000000000 + x = 0.846399621 + 0.648148148 x = 0.846399621 + 0.648148148 Combine like terms: 0.846399621 + 0.648148148 = 1.494547769 x = 1.494547769 Simplifying x = 1.494547769

Subproblem 2

x + -0.648148148 = -0.846399621 Simplifying x + -0.648148148 = -0.846399621 Reorder the terms: -0.648148148 + x = -0.846399621 Solving -0.648148148 + x = -0.846399621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.648148148' to each side of the equation. -0.648148148 + 0.648148148 + x = -0.846399621 + 0.648148148 Combine like terms: -0.648148148 + 0.648148148 = 0.000000000 0.000000000 + x = -0.846399621 + 0.648148148 x = -0.846399621 + 0.648148148 Combine like terms: -0.846399621 + 0.648148148 = -0.198251473 x = -0.198251473 Simplifying x = -0.198251473

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.494547769, -0.198251473}

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