100=10000+150x-0.2x^2

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Solution for 100=10000+150x-0.2x^2 equation:


Simplifying
100 = 10000 + 150x + -0.2x2

Solving
100 = 10000 + 150x + -0.2x2

Solving for variable 'x'.

Combine like terms: 100 + -10000 = -9900
-9900 + -150x + 0.2x2 = 10000 + 150x + -0.2x2 + -10000 + -150x + 0.2x2

Reorder the terms:
-9900 + -150x + 0.2x2 = 10000 + -10000 + 150x + -150x + -0.2x2 + 0.2x2

Combine like terms: 10000 + -10000 = 0
-9900 + -150x + 0.2x2 = 0 + 150x + -150x + -0.2x2 + 0.2x2
-9900 + -150x + 0.2x2 = 150x + -150x + -0.2x2 + 0.2x2

Combine like terms: 150x + -150x = 0
-9900 + -150x + 0.2x2 = 0 + -0.2x2 + 0.2x2
-9900 + -150x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
-9900 + -150x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
-49500 + -750x + x2 = 0

Move the constant term to the right:

Add '49500' to each side of the equation.
-49500 + -750x + 49500 + x2 = 0 + 49500

Reorder the terms:
-49500 + 49500 + -750x + x2 = 0 + 49500

Combine like terms: -49500 + 49500 = 0
0 + -750x + x2 = 0 + 49500
-750x + x2 = 0 + 49500

Combine like terms: 0 + 49500 = 49500
-750x + x2 = 49500

The x term is -750x.  Take half its coefficient (-375).
Square it (140625) and add it to both sides.

Add '140625' to each side of the equation.
-750x + 140625 + x2 = 49500 + 140625

Reorder the terms:
140625 + -750x + x2 = 49500 + 140625

Combine like terms: 49500 + 140625 = 190125
140625 + -750x + x2 = 190125

Factor a perfect square on the left side:
(x + -375)(x + -375) = 190125

Calculate the square root of the right side: 436.033255612

Break this problem into two subproblems by setting 
(x + -375) equal to 436.033255612 and -436.033255612.

Subproblem 1

x + -375 = 436.033255612 Simplifying x + -375 = 436.033255612 Reorder the terms: -375 + x = 436.033255612 Solving -375 + x = 436.033255612 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '375' to each side of the equation. -375 + 375 + x = 436.033255612 + 375 Combine like terms: -375 + 375 = 0 0 + x = 436.033255612 + 375 x = 436.033255612 + 375 Combine like terms: 436.033255612 + 375 = 811.033255612 x = 811.033255612 Simplifying x = 811.033255612

Subproblem 2

x + -375 = -436.033255612 Simplifying x + -375 = -436.033255612 Reorder the terms: -375 + x = -436.033255612 Solving -375 + x = -436.033255612 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '375' to each side of the equation. -375 + 375 + x = -436.033255612 + 375 Combine like terms: -375 + 375 = 0 0 + x = -436.033255612 + 375 x = -436.033255612 + 375 Combine like terms: -436.033255612 + 375 = -61.033255612 x = -61.033255612 Simplifying x = -61.033255612

Solution

The solution to the problem is based on the solutions from the subproblems. x = {811.033255612, -61.033255612}

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