80x+0.1x^2-(40x+0.2x^2+2000)=x

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Solution for 80x+0.1x^2-(40x+0.2x^2+2000)=x equation:


Simplifying
80x + 0.1x2 + -1(40x + 0.2x2 + 2000) = x

Reorder the terms:
80x + 0.1x2 + -1(2000 + 40x + 0.2x2) = x
80x + 0.1x2 + (2000 * -1 + 40x * -1 + 0.2x2 * -1) = x
80x + 0.1x2 + (-2000 + -40x + -0.2x2) = x

Reorder the terms:
-2000 + 80x + -40x + 0.1x2 + -0.2x2 = x

Combine like terms: 80x + -40x = 40x
-2000 + 40x + 0.1x2 + -0.2x2 = x

Combine like terms: 0.1x2 + -0.2x2 = -0.1x2
-2000 + 40x + -0.1x2 = x

Solving
-2000 + 40x + -0.1x2 = x

Solving for variable 'x'.

Reorder the terms:
-2000 + 40x + -1x + -0.1x2 = x + -1x

Combine like terms: 40x + -1x = 39x
-2000 + 39x + -0.1x2 = x + -1x

Combine like terms: x + -1x = 0
-2000 + 39x + -0.1x2 = 0

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

Divide each side by '-0.1'.
20000 + -390x + x2 = 0

Move the constant term to the right:

Add '-20000' to each side of the equation.
20000 + -390x + -20000 + x2 = 0 + -20000

Reorder the terms:
20000 + -20000 + -390x + x2 = 0 + -20000

Combine like terms: 20000 + -20000 = 0
0 + -390x + x2 = 0 + -20000
-390x + x2 = 0 + -20000

Combine like terms: 0 + -20000 = -20000
-390x + x2 = -20000

The x term is -390x.  Take half its coefficient (-195).
Square it (38025) and add it to both sides.

Add '38025' to each side of the equation.
-390x + 38025 + x2 = -20000 + 38025

Reorder the terms:
38025 + -390x + x2 = -20000 + 38025

Combine like terms: -20000 + 38025 = 18025
38025 + -390x + x2 = 18025

Factor a perfect square on the left side:
(x + -195)(x + -195) = 18025

Calculate the square root of the right side: 134.257215821

Break this problem into two subproblems by setting 
(x + -195) equal to 134.257215821 and -134.257215821.

Subproblem 1

x + -195 = 134.257215821 Simplifying x + -195 = 134.257215821 Reorder the terms: -195 + x = 134.257215821 Solving -195 + x = 134.257215821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '195' to each side of the equation. -195 + 195 + x = 134.257215821 + 195 Combine like terms: -195 + 195 = 0 0 + x = 134.257215821 + 195 x = 134.257215821 + 195 Combine like terms: 134.257215821 + 195 = 329.257215821 x = 329.257215821 Simplifying x = 329.257215821

Subproblem 2

x + -195 = -134.257215821 Simplifying x + -195 = -134.257215821 Reorder the terms: -195 + x = -134.257215821 Solving -195 + x = -134.257215821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '195' to each side of the equation. -195 + 195 + x = -134.257215821 + 195 Combine like terms: -195 + 195 = 0 0 + x = -134.257215821 + 195 x = -134.257215821 + 195 Combine like terms: -134.257215821 + 195 = 60.742784179 x = 60.742784179 Simplifying x = 60.742784179

Solution

The solution to the problem is based on the solutions from the subproblems. x = {329.257215821, 60.742784179}

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