45=.01x(120-x)

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Solution for 45=.01x(120-x) equation:


Simplifying
45 = 0.01x(120 + -1x)
45 = (120 * 0.01x + -1x * 0.01x)
45 = (1.2x + -0.01x2)

Solving
45 = 1.2x + -0.01x2

Solving for variable 'x'.

Reorder the terms:
45 + -1.2x + 0.01x2 = 1.2x + -1.2x + -0.01x2 + 0.01x2

Combine like terms: 1.2x + -1.2x = 0.0
45 + -1.2x + 0.01x2 = 0.0 + -0.01x2 + 0.01x2
45 + -1.2x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
45 + -1.2x + 0.01x2 = 0.00

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

Divide each side by '0.01'.
4500 + -120x + x2 = 0

Move the constant term to the right:

Add '-4500' to each side of the equation.
4500 + -120x + -4500 + x2 = 0 + -4500

Reorder the terms:
4500 + -4500 + -120x + x2 = 0 + -4500

Combine like terms: 4500 + -4500 = 0
0 + -120x + x2 = 0 + -4500
-120x + x2 = 0 + -4500

Combine like terms: 0 + -4500 = -4500
-120x + x2 = -4500

The x term is -120x.  Take half its coefficient (-60).
Square it (3600) and add it to both sides.

Add '3600' to each side of the equation.
-120x + 3600 + x2 = -4500 + 3600

Reorder the terms:
3600 + -120x + x2 = -4500 + 3600

Combine like terms: -4500 + 3600 = -900
3600 + -120x + x2 = -900

Factor a perfect square on the left side:
(x + -60)(x + -60) = -900

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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