-1500+100x-0.2x^2=0

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Solution for -1500+100x-0.2x^2=0 equation:


Simplifying
-1500 + 100x + -0.2x2 = 0

Solving
-1500 + 100x + -0.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '-0.2'.
7500 + -500x + x2 = 0

Move the constant term to the right:

Add '-7500' to each side of the equation.
7500 + -500x + -7500 + x2 = 0 + -7500

Reorder the terms:
7500 + -7500 + -500x + x2 = 0 + -7500

Combine like terms: 7500 + -7500 = 0
0 + -500x + x2 = 0 + -7500
-500x + x2 = 0 + -7500

Combine like terms: 0 + -7500 = -7500
-500x + x2 = -7500

The x term is -500x.  Take half its coefficient (-250).
Square it (62500) and add it to both sides.

Add '62500' to each side of the equation.
-500x + 62500 + x2 = -7500 + 62500

Reorder the terms:
62500 + -500x + x2 = -7500 + 62500

Combine like terms: -7500 + 62500 = 55000
62500 + -500x + x2 = 55000

Factor a perfect square on the left side:
(x + -250)(x + -250) = 55000

Calculate the square root of the right side: 234.520787991

Break this problem into two subproblems by setting 
(x + -250) equal to 234.520787991 and -234.520787991.

Subproblem 1

x + -250 = 234.520787991 Simplifying x + -250 = 234.520787991 Reorder the terms: -250 + x = 234.520787991 Solving -250 + x = 234.520787991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '250' to each side of the equation. -250 + 250 + x = 234.520787991 + 250 Combine like terms: -250 + 250 = 0 0 + x = 234.520787991 + 250 x = 234.520787991 + 250 Combine like terms: 234.520787991 + 250 = 484.520787991 x = 484.520787991 Simplifying x = 484.520787991

Subproblem 2

x + -250 = -234.520787991 Simplifying x + -250 = -234.520787991 Reorder the terms: -250 + x = -234.520787991 Solving -250 + x = -234.520787991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '250' to each side of the equation. -250 + 250 + x = -234.520787991 + 250 Combine like terms: -250 + 250 = 0 0 + x = -234.520787991 + 250 x = -234.520787991 + 250 Combine like terms: -234.520787991 + 250 = 15.479212009 x = 15.479212009 Simplifying x = 15.479212009

Solution

The solution to the problem is based on the solutions from the subproblems. x = {484.520787991, 15.479212009}

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