9(3x+6)=-x(x-2)

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Solution for 9(3x+6)=-x(x-2) equation:


Simplifying
9(3x + 6) = -1x(x + -2)

Reorder the terms:
9(6 + 3x) = -1x(x + -2)
(6 * 9 + 3x * 9) = -1x(x + -2)
(54 + 27x) = -1x(x + -2)

Reorder the terms:
54 + 27x = -1x(-2 + x)
54 + 27x = (-2 * -1x + x * -1x)
54 + 27x = (2x + -1x2)

Solving
54 + 27x = 2x + -1x2

Solving for variable 'x'.

Combine like terms: 27x + -2x = 25x
54 + 25x + x2 = 2x + -1x2 + -2x + x2

Reorder the terms:
54 + 25x + x2 = 2x + -2x + -1x2 + x2

Combine like terms: 2x + -2x = 0
54 + 25x + x2 = 0 + -1x2 + x2
54 + 25x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
54 + 25x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-54' to each side of the equation.
54 + 25x + -54 + x2 = 0 + -54

Reorder the terms:
54 + -54 + 25x + x2 = 0 + -54

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

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

The x term is 25x.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25x + 156.25 + x2 = -54 + 156.25

Reorder the terms:
156.25 + 25x + x2 = -54 + 156.25

Combine like terms: -54 + 156.25 = 102.25
156.25 + 25x + x2 = 102.25

Factor a perfect square on the left side:
(x + 12.5)(x + 12.5) = 102.25

Calculate the square root of the right side: 10.111874208

Break this problem into two subproblems by setting 
(x + 12.5) equal to 10.111874208 and -10.111874208.

Subproblem 1

x + 12.5 = 10.111874208 Simplifying x + 12.5 = 10.111874208 Reorder the terms: 12.5 + x = 10.111874208 Solving 12.5 + x = 10.111874208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = 10.111874208 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = 10.111874208 + -12.5 x = 10.111874208 + -12.5 Combine like terms: 10.111874208 + -12.5 = -2.388125792 x = -2.388125792 Simplifying x = -2.388125792

Subproblem 2

x + 12.5 = -10.111874208 Simplifying x + 12.5 = -10.111874208 Reorder the terms: 12.5 + x = -10.111874208 Solving 12.5 + x = -10.111874208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = -10.111874208 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = -10.111874208 + -12.5 x = -10.111874208 + -12.5 Combine like terms: -10.111874208 + -12.5 = -22.611874208 x = -22.611874208 Simplifying x = -22.611874208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.388125792, -22.611874208}

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