200x-x^2=2100

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Solution for 200x-x^2=2100 equation:


Simplifying
200x + -1x2 = 2100

Solving
200x + -1x2 = 2100

Solving for variable 'x'.

Reorder the terms:
-2100 + 200x + -1x2 = 2100 + -2100

Combine like terms: 2100 + -2100 = 0
-2100 + 200x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
2100 + -200x + x2 = 0

Move the constant term to the right:

Add '-2100' to each side of the equation.
2100 + -200x + -2100 + x2 = 0 + -2100

Reorder the terms:
2100 + -2100 + -200x + x2 = 0 + -2100

Combine like terms: 2100 + -2100 = 0
0 + -200x + x2 = 0 + -2100
-200x + x2 = 0 + -2100

Combine like terms: 0 + -2100 = -2100
-200x + x2 = -2100

The x term is -200x.  Take half its coefficient (-100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
-200x + 10000 + x2 = -2100 + 10000

Reorder the terms:
10000 + -200x + x2 = -2100 + 10000

Combine like terms: -2100 + 10000 = 7900
10000 + -200x + x2 = 7900

Factor a perfect square on the left side:
(x + -100)(x + -100) = 7900

Calculate the square root of the right side: 88.881944173

Break this problem into two subproblems by setting 
(x + -100) equal to 88.881944173 and -88.881944173.

Subproblem 1

x + -100 = 88.881944173 Simplifying x + -100 = 88.881944173 Reorder the terms: -100 + x = 88.881944173 Solving -100 + x = 88.881944173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = 88.881944173 + 100 Combine like terms: -100 + 100 = 0 0 + x = 88.881944173 + 100 x = 88.881944173 + 100 Combine like terms: 88.881944173 + 100 = 188.881944173 x = 188.881944173 Simplifying x = 188.881944173

Subproblem 2

x + -100 = -88.881944173 Simplifying x + -100 = -88.881944173 Reorder the terms: -100 + x = -88.881944173 Solving -100 + x = -88.881944173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = -88.881944173 + 100 Combine like terms: -100 + 100 = 0 0 + x = -88.881944173 + 100 x = -88.881944173 + 100 Combine like terms: -88.881944173 + 100 = 11.118055827 x = 11.118055827 Simplifying x = 11.118055827

Solution

The solution to the problem is based on the solutions from the subproblems. x = {188.881944173, 11.118055827}

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