10000=-0.15x^2+150x-1000

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Solution for 10000=-0.15x^2+150x-1000 equation:


Simplifying
10000 = -0.15x2 + 150x + -1000

Reorder the terms:
10000 = -1000 + 150x + -0.15x2

Solving
10000 = -1000 + 150x + -0.15x2

Solving for variable 'x'.

Combine like terms: 10000 + 1000 = 11000
11000 + -150x + 0.15x2 = -1000 + 150x + -0.15x2 + 1000 + -150x + 0.15x2

Reorder the terms:
11000 + -150x + 0.15x2 = -1000 + 1000 + 150x + -150x + -0.15x2 + 0.15x2

Combine like terms: -1000 + 1000 = 0
11000 + -150x + 0.15x2 = 0 + 150x + -150x + -0.15x2 + 0.15x2
11000 + -150x + 0.15x2 = 150x + -150x + -0.15x2 + 0.15x2

Combine like terms: 150x + -150x = 0
11000 + -150x + 0.15x2 = 0 + -0.15x2 + 0.15x2
11000 + -150x + 0.15x2 = -0.15x2 + 0.15x2

Combine like terms: -0.15x2 + 0.15x2 = 0.00
11000 + -150x + 0.15x2 = 0.00

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

Divide each side by '0.15'.
73333.33333 + -1000x + x2 = 0

Move the constant term to the right:

Add '-73333.33333' to each side of the equation.
73333.33333 + -1000x + -73333.33333 + x2 = 0 + -73333.33333

Reorder the terms:
73333.33333 + -73333.33333 + -1000x + x2 = 0 + -73333.33333

Combine like terms: 73333.33333 + -73333.33333 = 0.00000
0.00000 + -1000x + x2 = 0 + -73333.33333
-1000x + x2 = 0 + -73333.33333

Combine like terms: 0 + -73333.33333 = -73333.33333
-1000x + x2 = -73333.33333

The x term is -1000x.  Take half its coefficient (-500).
Square it (250000) and add it to both sides.

Add '250000' to each side of the equation.
-1000x + 250000 + x2 = -73333.33333 + 250000

Reorder the terms:
250000 + -1000x + x2 = -73333.33333 + 250000

Combine like terms: -73333.33333 + 250000 = 176666.66667
250000 + -1000x + x2 = 176666.66667

Factor a perfect square on the left side:
(x + -500)(x + -500) = 176666.66667

Calculate the square root of the right side: 420.317340435

Break this problem into two subproblems by setting 
(x + -500) equal to 420.317340435 and -420.317340435.

Subproblem 1

x + -500 = 420.317340435 Simplifying x + -500 = 420.317340435 Reorder the terms: -500 + x = 420.317340435 Solving -500 + x = 420.317340435 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '500' to each side of the equation. -500 + 500 + x = 420.317340435 + 500 Combine like terms: -500 + 500 = 0 0 + x = 420.317340435 + 500 x = 420.317340435 + 500 Combine like terms: 420.317340435 + 500 = 920.317340435 x = 920.317340435 Simplifying x = 920.317340435

Subproblem 2

x + -500 = -420.317340435 Simplifying x + -500 = -420.317340435 Reorder the terms: -500 + x = -420.317340435 Solving -500 + x = -420.317340435 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '500' to each side of the equation. -500 + 500 + x = -420.317340435 + 500 Combine like terms: -500 + 500 = 0 0 + x = -420.317340435 + 500 x = -420.317340435 + 500 Combine like terms: -420.317340435 + 500 = 79.682659565 x = 79.682659565 Simplifying x = 79.682659565

Solution

The solution to the problem is based on the solutions from the subproblems. x = {920.317340435, 79.682659565}

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