(-0.001x^2)+10x=7000+2x

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Solution for (-0.001x^2)+10x=7000+2x equation:


Simplifying
(-0.001x2) + 10x = 7000 + 2x

Reorder the terms:
10x + (-0.001x2) = 7000 + 2x

Solving
10x + (-0.001x2) = 7000 + 2x

Solving for variable 'x'.

Reorder the terms:
-7000 + 10x + -2x + (-0.001x2) = 7000 + 2x + -7000 + -2x

Combine like terms: 10x + -2x = 8x
-7000 + 8x + (-0.001x2) = 7000 + 2x + -7000 + -2x

Reorder the terms:
-7000 + 8x + (-0.001x2) = 7000 + -7000 + 2x + -2x

Combine like terms: 7000 + -7000 = 0
-7000 + 8x + (-0.001x2) = 0 + 2x + -2x
-7000 + 8x + (-0.001x2) = 2x + -2x

Combine like terms: 2x + -2x = 0
-7000 + 8x + (-0.001x2) = 0

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

Divide each side by '-0.001'.
7000000 + -8000x + x2 = 0

Move the constant term to the right:

Add '-7000000' to each side of the equation.
7000000 + -8000x + -7000000 + x2 = 0 + -7000000

Reorder the terms:
7000000 + -7000000 + -8000x + x2 = 0 + -7000000

Combine like terms: 7000000 + -7000000 = 0
0 + -8000x + x2 = 0 + -7000000
-8000x + x2 = 0 + -7000000

Combine like terms: 0 + -7000000 = -7000000
-8000x + x2 = -7000000

The x term is -8000x.  Take half its coefficient (-4000).
Square it (16000000) and add it to both sides.

Add '16000000' to each side of the equation.
-8000x + 16000000 + x2 = -7000000 + 16000000

Reorder the terms:
16000000 + -8000x + x2 = -7000000 + 16000000

Combine like terms: -7000000 + 16000000 = 9000000
16000000 + -8000x + x2 = 9000000

Factor a perfect square on the left side:
((x) + -4000)((x) + -4000) = 9000000

Calculate the square root of the right side: 3000

Break this problem into two subproblems by setting 
((x) + -4000) equal to 3000 and -3000.

Subproblem 1

(x) + -4000 = 3000 Simplifying (x) + -4000 = 3000 x + -4000 = 3000 Reorder the terms: -4000 + x = 3000 Solving -4000 + x = 3000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4000' to each side of the equation. -4000 + 4000 + x = 3000 + 4000 Combine like terms: -4000 + 4000 = 0 0 + x = 3000 + 4000 x = 3000 + 4000 Combine like terms: 3000 + 4000 = 7000 x = 7000 Simplifying x = 7000

Subproblem 2

(x) + -4000 = -3000 Simplifying (x) + -4000 = -3000 x + -4000 = -3000 Reorder the terms: -4000 + x = -3000 Solving -4000 + x = -3000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4000' to each side of the equation. -4000 + 4000 + x = -3000 + 4000 Combine like terms: -4000 + 4000 = 0 0 + x = -3000 + 4000 x = -3000 + 4000 Combine like terms: -3000 + 4000 = 1000 x = 1000 Simplifying x = 1000

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7000, 1000}

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