x*(45-0.5*x)=195.5

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Solution for x*(45-0.5*x)=195.5 equation:


Simplifying
x(45 + -0.5x) = 195.5
(45 * x + -0.5x * x) = 195.5
(45x + -0.5x2) = 195.5

Solving
45x + -0.5x2 = 195.5

Solving for variable 'x'.

Reorder the terms:
-195.5 + 45x + -0.5x2 = 195.5 + -195.5

Combine like terms: 195.5 + -195.5 = 0.0
-195.5 + 45x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
391 + -90x + x2 = 0

Move the constant term to the right:

Add '-391' to each side of the equation.
391 + -90x + -391 + x2 = 0 + -391

Reorder the terms:
391 + -391 + -90x + x2 = 0 + -391

Combine like terms: 391 + -391 = 0
0 + -90x + x2 = 0 + -391
-90x + x2 = 0 + -391

Combine like terms: 0 + -391 = -391
-90x + x2 = -391

The x term is -90x.  Take half its coefficient (-45).
Square it (2025) and add it to both sides.

Add '2025' to each side of the equation.
-90x + 2025 + x2 = -391 + 2025

Reorder the terms:
2025 + -90x + x2 = -391 + 2025

Combine like terms: -391 + 2025 = 1634
2025 + -90x + x2 = 1634

Factor a perfect square on the left side:
(x + -45)(x + -45) = 1634

Calculate the square root of the right side: 40.422765863

Break this problem into two subproblems by setting 
(x + -45) equal to 40.422765863 and -40.422765863.

Subproblem 1

x + -45 = 40.422765863 Simplifying x + -45 = 40.422765863 Reorder the terms: -45 + x = 40.422765863 Solving -45 + x = 40.422765863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = 40.422765863 + 45 Combine like terms: -45 + 45 = 0 0 + x = 40.422765863 + 45 x = 40.422765863 + 45 Combine like terms: 40.422765863 + 45 = 85.422765863 x = 85.422765863 Simplifying x = 85.422765863

Subproblem 2

x + -45 = -40.422765863 Simplifying x + -45 = -40.422765863 Reorder the terms: -45 + x = -40.422765863 Solving -45 + x = -40.422765863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = -40.422765863 + 45 Combine like terms: -45 + 45 = 0 0 + x = -40.422765863 + 45 x = -40.422765863 + 45 Combine like terms: -40.422765863 + 45 = 4.577234137 x = 4.577234137 Simplifying x = 4.577234137

Solution

The solution to the problem is based on the solutions from the subproblems. x = {85.422765863, 4.577234137}

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