1590=-0.1x^2+100x-15000

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Solution for 1590=-0.1x^2+100x-15000 equation:


Simplifying
1590 = -0.1x2 + 100x + -15000

Reorder the terms:
1590 = -15000 + 100x + -0.1x2

Solving
1590 = -15000 + 100x + -0.1x2

Solving for variable 'x'.

Combine like terms: 1590 + 15000 = 16590
16590 + -100x + 0.1x2 = -15000 + 100x + -0.1x2 + 15000 + -100x + 0.1x2

Reorder the terms:
16590 + -100x + 0.1x2 = -15000 + 15000 + 100x + -100x + -0.1x2 + 0.1x2

Combine like terms: -15000 + 15000 = 0
16590 + -100x + 0.1x2 = 0 + 100x + -100x + -0.1x2 + 0.1x2
16590 + -100x + 0.1x2 = 100x + -100x + -0.1x2 + 0.1x2

Combine like terms: 100x + -100x = 0
16590 + -100x + 0.1x2 = 0 + -0.1x2 + 0.1x2
16590 + -100x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
16590 + -100x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
165900 + -1000x + x2 = 0

Move the constant term to the right:

Add '-165900' to each side of the equation.
165900 + -1000x + -165900 + x2 = 0 + -165900

Reorder the terms:
165900 + -165900 + -1000x + x2 = 0 + -165900

Combine like terms: 165900 + -165900 = 0
0 + -1000x + x2 = 0 + -165900
-1000x + x2 = 0 + -165900

Combine like terms: 0 + -165900 = -165900
-1000x + x2 = -165900

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 = -165900 + 250000

Reorder the terms:
250000 + -1000x + x2 = -165900 + 250000

Combine like terms: -165900 + 250000 = 84100
250000 + -1000x + x2 = 84100

Factor a perfect square on the left side:
(x + -500)(x + -500) = 84100

Calculate the square root of the right side: 290

Break this problem into two subproblems by setting 
(x + -500) equal to 290 and -290.

Subproblem 1

x + -500 = 290 Simplifying x + -500 = 290 Reorder the terms: -500 + x = 290 Solving -500 + x = 290 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 = 290 + 500 Combine like terms: -500 + 500 = 0 0 + x = 290 + 500 x = 290 + 500 Combine like terms: 290 + 500 = 790 x = 790 Simplifying x = 790

Subproblem 2

x + -500 = -290 Simplifying x + -500 = -290 Reorder the terms: -500 + x = -290 Solving -500 + x = -290 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 = -290 + 500 Combine like terms: -500 + 500 = 0 0 + x = -290 + 500 x = -290 + 500 Combine like terms: -290 + 500 = 210 x = 210 Simplifying x = 210

Solution

The solution to the problem is based on the solutions from the subproblems. x = {790, 210}

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