500000=x(20-.0002x)

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Solution for 500000=x(20-.0002x) equation:


Simplifying
500000 = x(20 + -0.0002x)
500000 = (20 * x + -0.0002x * x)
500000 = (20x + -0.0002x2)

Solving
500000 = 20x + -0.0002x2

Solving for variable 'x'.

Reorder the terms:
500000 + -20x + 0.0002x2 = 20x + -20x + -0.0002x2 + 0.0002x2

Combine like terms: 20x + -20x = 0
500000 + -20x + 0.0002x2 = 0 + -0.0002x2 + 0.0002x2
500000 + -20x + 0.0002x2 = -0.0002x2 + 0.0002x2

Combine like terms: -0.0002x2 + 0.0002x2 = 0.0000
500000 + -20x + 0.0002x2 = 0.0000

Begin completing the square.  Divide all terms by
0.0002 the coefficient of the squared term: 

Divide each side by '0.0002'.
2500000000 + -100000x + x2 = 0

Move the constant term to the right:

Add '-2500000000' to each side of the equation.
2500000000 + -100000x + -2500000000 + x2 = 0 + -2500000000

Reorder the terms:
2500000000 + -2500000000 + -100000x + x2 = 0 + -2500000000

Combine like terms: 2500000000 + -2500000000 = 0
0 + -100000x + x2 = 0 + -2500000000
-100000x + x2 = 0 + -2500000000

Combine like terms: 0 + -2500000000 = -2500000000
-100000x + x2 = -2500000000

The x term is -100000x.  Take half its coefficient (-50000).
Square it (2500000000) and add it to both sides.

Add '2500000000' to each side of the equation.
-100000x + 2500000000 + x2 = -2500000000 + 2500000000

Reorder the terms:
2500000000 + -100000x + x2 = -2500000000 + 2500000000

Combine like terms: -2500000000 + 2500000000 = 0
2500000000 + -100000x + x2 = 0

Factor a perfect square on the left side:
(x + -50000)(x + -50000) = 0

Calculate the square root of the right side: 0

Break this problem into two subproblems by setting 
(x + -50000) equal to 0 and 0.

Subproblem 1

x + -50000 = 0 Simplifying x + -50000 = 0 Reorder the terms: -50000 + x = 0 Solving -50000 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50000' to each side of the equation. -50000 + 50000 + x = 0 + 50000 Combine like terms: -50000 + 50000 = 0 0 + x = 0 + 50000 x = 0 + 50000 Combine like terms: 0 + 50000 = 50000 x = 50000 Simplifying x = 50000

Subproblem 2

x + -50000 = 0 Simplifying x + -50000 = 0 Reorder the terms: -50000 + x = 0 Solving -50000 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50000' to each side of the equation. -50000 + 50000 + x = 0 + 50000 Combine like terms: -50000 + 50000 = 0 0 + x = 0 + 50000 x = 0 + 50000 Combine like terms: 0 + 50000 = 50000 x = 50000 Simplifying x = 50000

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50000, 50000}

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