x=-.025x^2+800x-70000

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Solution for x=-.025x^2+800x-70000 equation:


Simplifying
x = -0.025x2 + 800x + -70000

Reorder the terms:
x = -70000 + 800x + -0.025x2

Solving
x = -70000 + 800x + -0.025x2

Solving for variable 'x'.

Reorder the terms:
70000 + x + -800x + 0.025x2 = -70000 + 800x + -0.025x2 + 70000 + -800x + 0.025x2

Combine like terms: x + -800x = -799x
70000 + -799x + 0.025x2 = -70000 + 800x + -0.025x2 + 70000 + -800x + 0.025x2

Reorder the terms:
70000 + -799x + 0.025x2 = -70000 + 70000 + 800x + -800x + -0.025x2 + 0.025x2

Combine like terms: -70000 + 70000 = 0
70000 + -799x + 0.025x2 = 0 + 800x + -800x + -0.025x2 + 0.025x2
70000 + -799x + 0.025x2 = 800x + -800x + -0.025x2 + 0.025x2

Combine like terms: 800x + -800x = 0
70000 + -799x + 0.025x2 = 0 + -0.025x2 + 0.025x2
70000 + -799x + 0.025x2 = -0.025x2 + 0.025x2

Combine like terms: -0.025x2 + 0.025x2 = 0.000
70000 + -799x + 0.025x2 = 0.000

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

Divide each side by '0.025'.
2800000 + -31960x + x2 = 0

Move the constant term to the right:

Add '-2800000' to each side of the equation.
2800000 + -31960x + -2800000 + x2 = 0 + -2800000

Reorder the terms:
2800000 + -2800000 + -31960x + x2 = 0 + -2800000

Combine like terms: 2800000 + -2800000 = 0
0 + -31960x + x2 = 0 + -2800000
-31960x + x2 = 0 + -2800000

Combine like terms: 0 + -2800000 = -2800000
-31960x + x2 = -2800000

The x term is -31960x.  Take half its coefficient (-15980).
Square it (255360400) and add it to both sides.

Add '255360400' to each side of the equation.
-31960x + 255360400 + x2 = -2800000 + 255360400

Reorder the terms:
255360400 + -31960x + x2 = -2800000 + 255360400

Combine like terms: -2800000 + 255360400 = 252560400
255360400 + -31960x + x2 = 252560400

Factor a perfect square on the left side:
(x + -15980)(x + -15980) = 252560400

Calculate the square root of the right side: 15892.149005091

Break this problem into two subproblems by setting 
(x + -15980) equal to 15892.149005091 and -15892.149005091.

Subproblem 1

x + -15980 = 15892.149005091 Simplifying x + -15980 = 15892.149005091 Reorder the terms: -15980 + x = 15892.149005091 Solving -15980 + x = 15892.149005091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15980' to each side of the equation. -15980 + 15980 + x = 15892.149005091 + 15980 Combine like terms: -15980 + 15980 = 0 0 + x = 15892.149005091 + 15980 x = 15892.149005091 + 15980 Combine like terms: 15892.149005091 + 15980 = 31872.149005091 x = 31872.149005091 Simplifying x = 31872.149005091

Subproblem 2

x + -15980 = -15892.149005091 Simplifying x + -15980 = -15892.149005091 Reorder the terms: -15980 + x = -15892.149005091 Solving -15980 + x = -15892.149005091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15980' to each side of the equation. -15980 + 15980 + x = -15892.149005091 + 15980 Combine like terms: -15980 + 15980 = 0 0 + x = -15892.149005091 + 15980 x = -15892.149005091 + 15980 Combine like terms: -15892.149005091 + 15980 = 87.850994909 x = 87.850994909 Simplifying x = 87.850994909

Solution

The solution to the problem is based on the solutions from the subproblems. x = {31872.149005091, 87.850994909}

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