5x(9-x)=37.5

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Solution for 5x(9-x)=37.5 equation:


Simplifying
5x(9 + -1x) = 37.5
(9 * 5x + -1x * 5x) = 37.5
(45x + -5x2) = 37.5

Solving
45x + -5x2 = 37.5

Solving for variable 'x'.

Reorder the terms:
-37.5 + 45x + -5x2 = 37.5 + -37.5

Combine like terms: 37.5 + -37.5 = 0.0
-37.5 + 45x + -5x2 = 0.0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
7.5 + -9x + x2 = 0.0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -9x + -7.5 + x2 = 0.0 + -7.5

Reorder the terms:
7.5 + -7.5 + -9x + x2 = 0.0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -9x + x2 = 0.0 + -7.5
-9x + x2 = 0.0 + -7.5

Combine like terms: 0.0 + -7.5 = -7.5
-9x + x2 = -7.5

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = -7.5 + 20.25

Reorder the terms:
20.25 + -9x + x2 = -7.5 + 20.25

Combine like terms: -7.5 + 20.25 = 12.75
20.25 + -9x + x2 = 12.75

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 12.75

Calculate the square root of the right side: 3.570714214

Break this problem into two subproblems by setting 
(x + -4.5) equal to 3.570714214 and -3.570714214.

Subproblem 1

x + -4.5 = 3.570714214 Simplifying x + -4.5 = 3.570714214 Reorder the terms: -4.5 + x = 3.570714214 Solving -4.5 + x = 3.570714214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 3.570714214 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 3.570714214 + 4.5 x = 3.570714214 + 4.5 Combine like terms: 3.570714214 + 4.5 = 8.070714214 x = 8.070714214 Simplifying x = 8.070714214

Subproblem 2

x + -4.5 = -3.570714214 Simplifying x + -4.5 = -3.570714214 Reorder the terms: -4.5 + x = -3.570714214 Solving -4.5 + x = -3.570714214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -3.570714214 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -3.570714214 + 4.5 x = -3.570714214 + 4.5 Combine like terms: -3.570714214 + 4.5 = 0.929285786 x = 0.929285786 Simplifying x = 0.929285786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.070714214, 0.929285786}

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