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

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


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

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

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

Solving
xR = 36000 + 1400x + -20x2

Solving for variable 'x'.

Reorder the terms:
-36000 + -1400x + xR + 20x2 = 36000 + 1400x + -20x2 + -36000 + -1400x + 20x2

Reorder the terms:
-36000 + -1400x + xR + 20x2 = 36000 + -36000 + 1400x + -1400x + -20x2 + 20x2

Combine like terms: 36000 + -36000 = 0
-36000 + -1400x + xR + 20x2 = 0 + 1400x + -1400x + -20x2 + 20x2
-36000 + -1400x + xR + 20x2 = 1400x + -1400x + -20x2 + 20x2

Combine like terms: 1400x + -1400x = 0
-36000 + -1400x + xR + 20x2 = 0 + -20x2 + 20x2
-36000 + -1400x + xR + 20x2 = -20x2 + 20x2

Combine like terms: -20x2 + 20x2 = 0
-36000 + -1400x + xR + 20x2 = 0

The solution to this equation could not be determined.

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