(13-x)(6-x)(4)=280.8

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Solution for (13-x)(6-x)(4)=280.8 equation:


Simplifying
(13 + -1x)(6 + -1x)(4) = 280.8

Reorder the terms for easier multiplication:
4(13 + -1x)(6 + -1x) = 280.8

Multiply (13 + -1x) * (6 + -1x)
4(13(6 + -1x) + -1x * (6 + -1x)) = 280.8
4((6 * 13 + -1x * 13) + -1x * (6 + -1x)) = 280.8
4((78 + -13x) + -1x * (6 + -1x)) = 280.8
4(78 + -13x + (6 * -1x + -1x * -1x)) = 280.8
4(78 + -13x + (-6x + 1x2)) = 280.8

Combine like terms: -13x + -6x = -19x
4(78 + -19x + 1x2) = 280.8
(78 * 4 + -19x * 4 + 1x2 * 4) = 280.8
(312 + -76x + 4x2) = 280.8

Solving
312 + -76x + 4x2 = 280.8

Solving for variable 'x'.

Reorder the terms:
312 + -280.8 + -76x + 4x2 = 280.8 + -280.8

Combine like terms: 312 + -280.8 = 31.2
31.2 + -76x + 4x2 = 280.8 + -280.8

Combine like terms: 280.8 + -280.8 = 0.0
31.2 + -76x + 4x2 = 0.0

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

Divide each side by '4'.
7.8 + -19x + x2 = 0.0

Move the constant term to the right:

Add '-7.8' to each side of the equation.
7.8 + -19x + -7.8 + x2 = 0.0 + -7.8

Reorder the terms:
7.8 + -7.8 + -19x + x2 = 0.0 + -7.8

Combine like terms: 7.8 + -7.8 = 0.0
0.0 + -19x + x2 = 0.0 + -7.8
-19x + x2 = 0.0 + -7.8

Combine like terms: 0.0 + -7.8 = -7.8
-19x + x2 = -7.8

The x term is -19x.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19x + 90.25 + x2 = -7.8 + 90.25

Reorder the terms:
90.25 + -19x + x2 = -7.8 + 90.25

Combine like terms: -7.8 + 90.25 = 82.45
90.25 + -19x + x2 = 82.45

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 82.45

Calculate the square root of the right side: 9.080198236

Break this problem into two subproblems by setting 
(x + -9.5) equal to 9.080198236 and -9.080198236.

Subproblem 1

x + -9.5 = 9.080198236 Simplifying x + -9.5 = 9.080198236 Reorder the terms: -9.5 + x = 9.080198236 Solving -9.5 + x = 9.080198236 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = 9.080198236 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 9.080198236 + 9.5 x = 9.080198236 + 9.5 Combine like terms: 9.080198236 + 9.5 = 18.580198236 x = 18.580198236 Simplifying x = 18.580198236

Subproblem 2

x + -9.5 = -9.080198236 Simplifying x + -9.5 = -9.080198236 Reorder the terms: -9.5 + x = -9.080198236 Solving -9.5 + x = -9.080198236 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = -9.080198236 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -9.080198236 + 9.5 x = -9.080198236 + 9.5 Combine like terms: -9.080198236 + 9.5 = 0.419801764 x = 0.419801764 Simplifying x = 0.419801764

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.580198236, 0.419801764}

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