(15-x)(9-x)(3)=364.5

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Solution for (15-x)(9-x)(3)=364.5 equation:


Simplifying
(15 + -1x)(9 + -1x)(3) = 364.5

Reorder the terms for easier multiplication:
3(15 + -1x)(9 + -1x) = 364.5

Multiply (15 + -1x) * (9 + -1x)
3(15(9 + -1x) + -1x * (9 + -1x)) = 364.5
3((9 * 15 + -1x * 15) + -1x * (9 + -1x)) = 364.5
3((135 + -15x) + -1x * (9 + -1x)) = 364.5
3(135 + -15x + (9 * -1x + -1x * -1x)) = 364.5
3(135 + -15x + (-9x + 1x2)) = 364.5

Combine like terms: -15x + -9x = -24x
3(135 + -24x + 1x2) = 364.5
(135 * 3 + -24x * 3 + 1x2 * 3) = 364.5
(405 + -72x + 3x2) = 364.5

Solving
405 + -72x + 3x2 = 364.5

Solving for variable 'x'.

Reorder the terms:
405 + -364.5 + -72x + 3x2 = 364.5 + -364.5

Combine like terms: 405 + -364.5 = 40.5
40.5 + -72x + 3x2 = 364.5 + -364.5

Combine like terms: 364.5 + -364.5 = 0.0
40.5 + -72x + 3x2 = 0.0

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

Divide each side by '3'.
13.5 + -24x + x2 = 0.0

Move the constant term to the right:

Add '-13.5' to each side of the equation.
13.5 + -24x + -13.5 + x2 = 0.0 + -13.5

Reorder the terms:
13.5 + -13.5 + -24x + x2 = 0.0 + -13.5

Combine like terms: 13.5 + -13.5 = 0.0
0.0 + -24x + x2 = 0.0 + -13.5
-24x + x2 = 0.0 + -13.5

Combine like terms: 0.0 + -13.5 = -13.5
-24x + x2 = -13.5

The x term is -24x.  Take half its coefficient (-12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
-24x + 144 + x2 = -13.5 + 144

Reorder the terms:
144 + -24x + x2 = -13.5 + 144

Combine like terms: -13.5 + 144 = 130.5
144 + -24x + x2 = 130.5

Factor a perfect square on the left side:
(x + -12)(x + -12) = 130.5

Calculate the square root of the right side: 11.423659659

Break this problem into two subproblems by setting 
(x + -12) equal to 11.423659659 and -11.423659659.

Subproblem 1

x + -12 = 11.423659659 Simplifying x + -12 = 11.423659659 Reorder the terms: -12 + x = 11.423659659 Solving -12 + x = 11.423659659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = 11.423659659 + 12 Combine like terms: -12 + 12 = 0 0 + x = 11.423659659 + 12 x = 11.423659659 + 12 Combine like terms: 11.423659659 + 12 = 23.423659659 x = 23.423659659 Simplifying x = 23.423659659

Subproblem 2

x + -12 = -11.423659659 Simplifying x + -12 = -11.423659659 Reorder the terms: -12 + x = -11.423659659 Solving -12 + x = -11.423659659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = -11.423659659 + 12 Combine like terms: -12 + 12 = 0 0 + x = -11.423659659 + 12 x = -11.423659659 + 12 Combine like terms: -11.423659659 + 12 = 0.576340341 x = 0.576340341 Simplifying x = 0.576340341

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.423659659, 0.576340341}

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