x(45-x)=9

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Solution for x(45-x)=9 equation:


Simplifying
x(45 + -1x) = 9
(45 * x + -1x * x) = 9
(45x + -1x2) = 9

Solving
45x + -1x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 45x + -1x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 45x + -1x2 = 0

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

Divide each side by '-1'.
9 + -45x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -45x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -45x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -45x + x2 = 0 + -9
-45x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-45x + x2 = -9

The x term is -45x.  Take half its coefficient (-22.5).
Square it (506.25) and add it to both sides.

Add '506.25' to each side of the equation.
-45x + 506.25 + x2 = -9 + 506.25

Reorder the terms:
506.25 + -45x + x2 = -9 + 506.25

Combine like terms: -9 + 506.25 = 497.25
506.25 + -45x + x2 = 497.25

Factor a perfect square on the left side:
(x + -22.5)(x + -22.5) = 497.25

Calculate the square root of the right side: 22.299103121

Break this problem into two subproblems by setting 
(x + -22.5) equal to 22.299103121 and -22.299103121.

Subproblem 1

x + -22.5 = 22.299103121 Simplifying x + -22.5 = 22.299103121 Reorder the terms: -22.5 + x = 22.299103121 Solving -22.5 + x = 22.299103121 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.5' to each side of the equation. -22.5 + 22.5 + x = 22.299103121 + 22.5 Combine like terms: -22.5 + 22.5 = 0.0 0.0 + x = 22.299103121 + 22.5 x = 22.299103121 + 22.5 Combine like terms: 22.299103121 + 22.5 = 44.799103121 x = 44.799103121 Simplifying x = 44.799103121

Subproblem 2

x + -22.5 = -22.299103121 Simplifying x + -22.5 = -22.299103121 Reorder the terms: -22.5 + x = -22.299103121 Solving -22.5 + x = -22.299103121 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.5' to each side of the equation. -22.5 + 22.5 + x = -22.299103121 + 22.5 Combine like terms: -22.5 + 22.5 = 0.0 0.0 + x = -22.299103121 + 22.5 x = -22.299103121 + 22.5 Combine like terms: -22.299103121 + 22.5 = 0.200896879 x = 0.200896879 Simplifying x = 0.200896879

Solution

The solution to the problem is based on the solutions from the subproblems. x = {44.799103121, 0.200896879}

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