50000=20x-.001x^2

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Solution for 50000=20x-.001x^2 equation:


Simplifying
50000 = 20x + -0.001x2

Solving
50000 = 20x + -0.001x2

Solving for variable 'x'.

Reorder the terms:
50000 + -20x + 0.001x2 = 20x + -20x + -0.001x2 + 0.001x2

Combine like terms: 20x + -20x = 0
50000 + -20x + 0.001x2 = 0 + -0.001x2 + 0.001x2
50000 + -20x + 0.001x2 = -0.001x2 + 0.001x2

Combine like terms: -0.001x2 + 0.001x2 = 0.000
50000 + -20x + 0.001x2 = 0.000

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

Divide each side by '0.001'.
50000000 + -20000x + x2 = 0

Move the constant term to the right:

Add '-50000000' to each side of the equation.
50000000 + -20000x + -50000000 + x2 = 0 + -50000000

Reorder the terms:
50000000 + -50000000 + -20000x + x2 = 0 + -50000000

Combine like terms: 50000000 + -50000000 = 0
0 + -20000x + x2 = 0 + -50000000
-20000x + x2 = 0 + -50000000

Combine like terms: 0 + -50000000 = -50000000
-20000x + x2 = -50000000

The x term is -20000x.  Take half its coefficient (-10000).
Square it (100000000) and add it to both sides.

Add '100000000' to each side of the equation.
-20000x + 100000000 + x2 = -50000000 + 100000000

Reorder the terms:
100000000 + -20000x + x2 = -50000000 + 100000000

Combine like terms: -50000000 + 100000000 = 50000000
100000000 + -20000x + x2 = 50000000

Factor a perfect square on the left side:
(x + -10000)(x + -10000) = 50000000

Calculate the square root of the right side: 7071.067811865

Break this problem into two subproblems by setting 
(x + -10000) equal to 7071.067811865 and -7071.067811865.

Subproblem 1

x + -10000 = 7071.067811865 Simplifying x + -10000 = 7071.067811865 Reorder the terms: -10000 + x = 7071.067811865 Solving -10000 + x = 7071.067811865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10000' to each side of the equation. -10000 + 10000 + x = 7071.067811865 + 10000 Combine like terms: -10000 + 10000 = 0 0 + x = 7071.067811865 + 10000 x = 7071.067811865 + 10000 Combine like terms: 7071.067811865 + 10000 = 17071.067811865 x = 17071.067811865 Simplifying x = 17071.067811865

Subproblem 2

x + -10000 = -7071.067811865 Simplifying x + -10000 = -7071.067811865 Reorder the terms: -10000 + x = -7071.067811865 Solving -10000 + x = -7071.067811865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10000' to each side of the equation. -10000 + 10000 + x = -7071.067811865 + 10000 Combine like terms: -10000 + 10000 = 0 0 + x = -7071.067811865 + 10000 x = -7071.067811865 + 10000 Combine like terms: -7071.067811865 + 10000 = 2928.932188135 x = 2928.932188135 Simplifying x = 2928.932188135

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17071.067811865, 2928.932188135}

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