fx=(400+20x)(90-1x)

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Solution for fx=(400+20x)(90-1x) equation: 


Simplifying
fx = (400 + 20x)(90 + -1x)

Multiply (400 + 20x) * (90 + -1x)
fx = (400(90 + -1x) + 20x * (90 + -1x))
fx = ((90 * 400 + -1x * 400) + 20x * (90 + -1x))
fx = ((36000 + -400x) + 20x * (90 + -1x))
fx = (36000 + -400x + (90 * 20x + -1x * 20x))
fx = (36000 + -400x + (1800x + -20x2))

Combine like terms: -400x + 1800x = 1400x
fx = (36000 + 1400x + -20x2)

Solving
fx = 36000 + 1400x + -20x2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f = 36000x-1 + 1400 + -20x

Simplifying
f = 36000x-1 + 1400 + -20x

Reorder the terms:
f = 1400 + 36000x-1 + -20x

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