480=x(50-0.2x)

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Solution for 480=x(50-0.2x) equation:


Simplifying
480 = x(50 + -0.2x)
480 = (50 * x + -0.2x * x)
480 = (50x + -0.2x2)

Solving
480 = 50x + -0.2x2

Solving for variable 'x'.

Reorder the terms:
480 + -50x + 0.2x2 = 50x + -50x + -0.2x2 + 0.2x2

Combine like terms: 50x + -50x = 0
480 + -50x + 0.2x2 = 0 + -0.2x2 + 0.2x2
480 + -50x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
480 + -50x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
2400 + -250x + x2 = 0

Move the constant term to the right:

Add '-2400' to each side of the equation.
2400 + -250x + -2400 + x2 = 0 + -2400

Reorder the terms:
2400 + -2400 + -250x + x2 = 0 + -2400

Combine like terms: 2400 + -2400 = 0
0 + -250x + x2 = 0 + -2400
-250x + x2 = 0 + -2400

Combine like terms: 0 + -2400 = -2400
-250x + x2 = -2400

The x term is -250x.  Take half its coefficient (-125).
Square it (15625) and add it to both sides.

Add '15625' to each side of the equation.
-250x + 15625 + x2 = -2400 + 15625

Reorder the terms:
15625 + -250x + x2 = -2400 + 15625

Combine like terms: -2400 + 15625 = 13225
15625 + -250x + x2 = 13225

Factor a perfect square on the left side:
(x + -125)(x + -125) = 13225

Calculate the square root of the right side: 115

Break this problem into two subproblems by setting 
(x + -125) equal to 115 and -115.

Subproblem 1

x + -125 = 115 Simplifying x + -125 = 115 Reorder the terms: -125 + x = 115 Solving -125 + x = 115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '125' to each side of the equation. -125 + 125 + x = 115 + 125 Combine like terms: -125 + 125 = 0 0 + x = 115 + 125 x = 115 + 125 Combine like terms: 115 + 125 = 240 x = 240 Simplifying x = 240

Subproblem 2

x + -125 = -115 Simplifying x + -125 = -115 Reorder the terms: -125 + x = -115 Solving -125 + x = -115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '125' to each side of the equation. -125 + 125 + x = -115 + 125 Combine like terms: -125 + 125 = 0 0 + x = -115 + 125 x = -115 + 125 Combine like terms: -115 + 125 = 10 x = 10 Simplifying x = 10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {240, 10}

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