90x-(2500+10x+.2x^2)=0

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Solution for 90x-(2500+10x+.2x^2)=0 equation:


Simplifying
90x + -1(2500 + 10x + 0.2x2) = 0
90x + (2500 * -1 + 10x * -1 + 0.2x2 * -1) = 0
90x + (-2500 + -10x + -0.2x2) = 0

Reorder the terms:
-2500 + 90x + -10x + -0.2x2 = 0

Combine like terms: 90x + -10x = 80x
-2500 + 80x + -0.2x2 = 0

Solving
-2500 + 80x + -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'.
12500 + -400x + x2 = 0

Move the constant term to the right:

Add '-12500' to each side of the equation.
12500 + -400x + -12500 + x2 = 0 + -12500

Reorder the terms:
12500 + -12500 + -400x + x2 = 0 + -12500

Combine like terms: 12500 + -12500 = 0
0 + -400x + x2 = 0 + -12500
-400x + x2 = 0 + -12500

Combine like terms: 0 + -12500 = -12500
-400x + x2 = -12500

The x term is -400x.  Take half its coefficient (-200).
Square it (40000) and add it to both sides.

Add '40000' to each side of the equation.
-400x + 40000 + x2 = -12500 + 40000

Reorder the terms:
40000 + -400x + x2 = -12500 + 40000

Combine like terms: -12500 + 40000 = 27500
40000 + -400x + x2 = 27500

Factor a perfect square on the left side:
(x + -200)(x + -200) = 27500

Calculate the square root of the right side: 165.831239518

Break this problem into two subproblems by setting 
(x + -200) equal to 165.831239518 and -165.831239518.

Subproblem 1

x + -200 = 165.831239518 Simplifying x + -200 = 165.831239518 Reorder the terms: -200 + x = 165.831239518 Solving -200 + x = 165.831239518 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = 165.831239518 + 200 Combine like terms: -200 + 200 = 0 0 + x = 165.831239518 + 200 x = 165.831239518 + 200 Combine like terms: 165.831239518 + 200 = 365.831239518 x = 365.831239518 Simplifying x = 365.831239518

Subproblem 2

x + -200 = -165.831239518 Simplifying x + -200 = -165.831239518 Reorder the terms: -200 + x = -165.831239518 Solving -200 + x = -165.831239518 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = -165.831239518 + 200 Combine like terms: -200 + 200 = 0 0 + x = -165.831239518 + 200 x = -165.831239518 + 200 Combine like terms: -165.831239518 + 200 = 34.168760482 x = 34.168760482 Simplifying x = 34.168760482

Solution

The solution to the problem is based on the solutions from the subproblems. x = {365.831239518, 34.168760482}

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