x-(50+0.2x)x=200

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Solution for x-(50+0.2x)x=200 equation:


Simplifying
x + -1(50 + 0.2x) * x = 200

Reorder the terms for easier multiplication:
x + -1x(50 + 0.2x) = 200
x + (50 * -1x + 0.2x * -1x) = 200
x + (-50x + -0.2x2) = 200

Combine like terms: x + -50x = -49x
-49x + -0.2x2 = 200

Solving
-49x + -0.2x2 = 200

Solving for variable 'x'.

Reorder the terms:
-200 + -49x + -0.2x2 = 200 + -200

Combine like terms: 200 + -200 = 0
-200 + -49x + -0.2x2 = 0

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

Divide each side by '-0.2'.
1000 + 245x + x2 = 0

Move the constant term to the right:

Add '-1000' to each side of the equation.
1000 + 245x + -1000 + x2 = 0 + -1000

Reorder the terms:
1000 + -1000 + 245x + x2 = 0 + -1000

Combine like terms: 1000 + -1000 = 0
0 + 245x + x2 = 0 + -1000
245x + x2 = 0 + -1000

Combine like terms: 0 + -1000 = -1000
245x + x2 = -1000

The x term is 245x.  Take half its coefficient (122.5).
Square it (15006.25) and add it to both sides.

Add '15006.25' to each side of the equation.
245x + 15006.25 + x2 = -1000 + 15006.25

Reorder the terms:
15006.25 + 245x + x2 = -1000 + 15006.25

Combine like terms: -1000 + 15006.25 = 14006.25
15006.25 + 245x + x2 = 14006.25

Factor a perfect square on the left side:
(x + 122.5)(x + 122.5) = 14006.25

Calculate the square root of the right side: 118.348003785

Break this problem into two subproblems by setting 
(x + 122.5) equal to 118.348003785 and -118.348003785.

Subproblem 1

x + 122.5 = 118.348003785 Simplifying x + 122.5 = 118.348003785 Reorder the terms: 122.5 + x = 118.348003785 Solving 122.5 + x = 118.348003785 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-122.5' to each side of the equation. 122.5 + -122.5 + x = 118.348003785 + -122.5 Combine like terms: 122.5 + -122.5 = 0.0 0.0 + x = 118.348003785 + -122.5 x = 118.348003785 + -122.5 Combine like terms: 118.348003785 + -122.5 = -4.151996215 x = -4.151996215 Simplifying x = -4.151996215

Subproblem 2

x + 122.5 = -118.348003785 Simplifying x + 122.5 = -118.348003785 Reorder the terms: 122.5 + x = -118.348003785 Solving 122.5 + x = -118.348003785 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-122.5' to each side of the equation. 122.5 + -122.5 + x = -118.348003785 + -122.5 Combine like terms: 122.5 + -122.5 = 0.0 0.0 + x = -118.348003785 + -122.5 x = -118.348003785 + -122.5 Combine like terms: -118.348003785 + -122.5 = -240.848003785 x = -240.848003785 Simplifying x = -240.848003785

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.151996215, -240.848003785}

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