20(500-2.2x)=x*x

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Solution for 20(500-2.2x)=x*x equation:


Simplifying
20(500 + -2.2x) = x * x
(500 * 20 + -2.2x * 20) = x * x
(10000 + -44x) = x * x

Multiply x * x
10000 + -44x = x2

Solving
10000 + -44x = x2

Solving for variable 'x'.

Combine like terms: x2 + -1x2 = 0
10000 + -44x + -1x2 = 0

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

Divide each side by '-1'.
-10000 + 44x + x2 = 0

Move the constant term to the right:

Add '10000' to each side of the equation.
-10000 + 44x + 10000 + x2 = 0 + 10000

Reorder the terms:
-10000 + 10000 + 44x + x2 = 0 + 10000

Combine like terms: -10000 + 10000 = 0
0 + 44x + x2 = 0 + 10000
44x + x2 = 0 + 10000

Combine like terms: 0 + 10000 = 10000
44x + x2 = 10000

The x term is 44x.  Take half its coefficient (22).
Square it (484) and add it to both sides.

Add '484' to each side of the equation.
44x + 484 + x2 = 10000 + 484

Reorder the terms:
484 + 44x + x2 = 10000 + 484

Combine like terms: 10000 + 484 = 10484
484 + 44x + x2 = 10484

Factor a perfect square on the left side:
(x + 22)(x + 22) = 10484

Calculate the square root of the right side: 102.391405889

Break this problem into two subproblems by setting 
(x + 22) equal to 102.391405889 and -102.391405889.

Subproblem 1

x + 22 = 102.391405889 Simplifying x + 22 = 102.391405889 Reorder the terms: 22 + x = 102.391405889 Solving 22 + x = 102.391405889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + x = 102.391405889 + -22 Combine like terms: 22 + -22 = 0 0 + x = 102.391405889 + -22 x = 102.391405889 + -22 Combine like terms: 102.391405889 + -22 = 80.391405889 x = 80.391405889 Simplifying x = 80.391405889

Subproblem 2

x + 22 = -102.391405889 Simplifying x + 22 = -102.391405889 Reorder the terms: 22 + x = -102.391405889 Solving 22 + x = -102.391405889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + x = -102.391405889 + -22 Combine like terms: 22 + -22 = 0 0 + x = -102.391405889 + -22 x = -102.391405889 + -22 Combine like terms: -102.391405889 + -22 = -124.391405889 x = -124.391405889 Simplifying x = -124.391405889

Solution

The solution to the problem is based on the solutions from the subproblems. x = {80.391405889, -124.391405889}

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