50.4=2.5x(15-x)-2

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Solution for 50.4=2.5x(15-x)-2 equation:


Simplifying
50.4 = 2.5x(15 + -1x) + -2
50.4 = (15 * 2.5x + -1x * 2.5x) + -2
50.4 = (37.5x + -2.5x2) + -2

Reorder the terms:
50.4 = -2 + 37.5x + -2.5x2

Solving
50.4 = -2 + 37.5x + -2.5x2

Solving for variable 'x'.

Combine like terms: 50.4 + 2 = 52.4
52.4 + -37.5x + 2.5x2 = -2 + 37.5x + -2.5x2 + 2 + -37.5x + 2.5x2

Reorder the terms:
52.4 + -37.5x + 2.5x2 = -2 + 2 + 37.5x + -37.5x + -2.5x2 + 2.5x2

Combine like terms: -2 + 2 = 0
52.4 + -37.5x + 2.5x2 = 0 + 37.5x + -37.5x + -2.5x2 + 2.5x2
52.4 + -37.5x + 2.5x2 = 37.5x + -37.5x + -2.5x2 + 2.5x2

Combine like terms: 37.5x + -37.5x = 0.0
52.4 + -37.5x + 2.5x2 = 0.0 + -2.5x2 + 2.5x2
52.4 + -37.5x + 2.5x2 = -2.5x2 + 2.5x2

Combine like terms: -2.5x2 + 2.5x2 = 0.0
52.4 + -37.5x + 2.5x2 = 0.0

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

Divide each side by '2.5'.
20.96 + -15x + x2 = 0

Move the constant term to the right:

Add '-20.96' to each side of the equation.
20.96 + -15x + -20.96 + x2 = 0 + -20.96

Reorder the terms:
20.96 + -20.96 + -15x + x2 = 0 + -20.96

Combine like terms: 20.96 + -20.96 = 0.00
0.00 + -15x + x2 = 0 + -20.96
-15x + x2 = 0 + -20.96

Combine like terms: 0 + -20.96 = -20.96
-15x + x2 = -20.96

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = -20.96 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -20.96 + 56.25

Combine like terms: -20.96 + 56.25 = 35.29
56.25 + -15x + x2 = 35.29

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 35.29

Calculate the square root of the right side: 5.940538696

Break this problem into two subproblems by setting 
(x + -7.5) equal to 5.940538696 and -5.940538696.

Subproblem 1

x + -7.5 = 5.940538696 Simplifying x + -7.5 = 5.940538696 Reorder the terms: -7.5 + x = 5.940538696 Solving -7.5 + x = 5.940538696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 5.940538696 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 5.940538696 + 7.5 x = 5.940538696 + 7.5 Combine like terms: 5.940538696 + 7.5 = 13.440538696 x = 13.440538696 Simplifying x = 13.440538696

Subproblem 2

x + -7.5 = -5.940538696 Simplifying x + -7.5 = -5.940538696 Reorder the terms: -7.5 + x = -5.940538696 Solving -7.5 + x = -5.940538696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -5.940538696 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -5.940538696 + 7.5 x = -5.940538696 + 7.5 Combine like terms: -5.940538696 + 7.5 = 1.559461304 x = 1.559461304 Simplifying x = 1.559461304

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.440538696, 1.559461304}

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