x=(200-10x)*(10+x)

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Solution for x=(200-10x)*(10+x) equation:


Simplifying
x = (200 + -10x)(10 + x)

Multiply (200 + -10x) * (10 + x)
x = (200(10 + x) + -10x * (10 + x))
x = ((10 * 200 + x * 200) + -10x * (10 + x))
x = ((2000 + 200x) + -10x * (10 + x))
x = (2000 + 200x + (10 * -10x + x * -10x))
x = (2000 + 200x + (-100x + -10x2))

Combine like terms: 200x + -100x = 100x
x = (2000 + 100x + -10x2)

Solving
x = 2000 + 100x + -10x2

Solving for variable 'x'.

Reorder the terms:
-2000 + x + -100x + 10x2 = 2000 + 100x + -10x2 + -2000 + -100x + 10x2

Combine like terms: x + -100x = -99x
-2000 + -99x + 10x2 = 2000 + 100x + -10x2 + -2000 + -100x + 10x2

Reorder the terms:
-2000 + -99x + 10x2 = 2000 + -2000 + 100x + -100x + -10x2 + 10x2

Combine like terms: 2000 + -2000 = 0
-2000 + -99x + 10x2 = 0 + 100x + -100x + -10x2 + 10x2
-2000 + -99x + 10x2 = 100x + -100x + -10x2 + 10x2

Combine like terms: 100x + -100x = 0
-2000 + -99x + 10x2 = 0 + -10x2 + 10x2
-2000 + -99x + 10x2 = -10x2 + 10x2

Combine like terms: -10x2 + 10x2 = 0
-2000 + -99x + 10x2 = 0

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

Divide each side by '10'.
-200 + -9.9x + x2 = 0

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + -9.9x + 200 + x2 = 0 + 200

Reorder the terms:
-200 + 200 + -9.9x + x2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + -9.9x + x2 = 0 + 200
-9.9x + x2 = 0 + 200

Combine like terms: 0 + 200 = 200
-9.9x + x2 = 200

The x term is -9.9x.  Take half its coefficient (-4.95).
Square it (24.5025) and add it to both sides.

Add '24.5025' to each side of the equation.
-9.9x + 24.5025 + x2 = 200 + 24.5025

Reorder the terms:
24.5025 + -9.9x + x2 = 200 + 24.5025

Combine like terms: 200 + 24.5025 = 224.5025
24.5025 + -9.9x + x2 = 224.5025

Factor a perfect square on the left side:
(x + -4.95)(x + -4.95) = 224.5025

Calculate the square root of the right side: 14.98340749

Break this problem into two subproblems by setting 
(x + -4.95) equal to 14.98340749 and -14.98340749.

Subproblem 1

x + -4.95 = 14.98340749 Simplifying x + -4.95 = 14.98340749 Reorder the terms: -4.95 + x = 14.98340749 Solving -4.95 + x = 14.98340749 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.95' to each side of the equation. -4.95 + 4.95 + x = 14.98340749 + 4.95 Combine like terms: -4.95 + 4.95 = 0.00 0.00 + x = 14.98340749 + 4.95 x = 14.98340749 + 4.95 Combine like terms: 14.98340749 + 4.95 = 19.93340749 x = 19.93340749 Simplifying x = 19.93340749

Subproblem 2

x + -4.95 = -14.98340749 Simplifying x + -4.95 = -14.98340749 Reorder the terms: -4.95 + x = -14.98340749 Solving -4.95 + x = -14.98340749 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.95' to each side of the equation. -4.95 + 4.95 + x = -14.98340749 + 4.95 Combine like terms: -4.95 + 4.95 = 0.00 0.00 + x = -14.98340749 + 4.95 x = -14.98340749 + 4.95 Combine like terms: -14.98340749 + 4.95 = -10.03340749 x = -10.03340749 Simplifying x = -10.03340749

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.93340749, -10.03340749}

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