y=(400+20x)(90+1x)

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


Simplifying
y = (400 + 20x)(90 + 1x)

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

Combine like terms: 400x + 1800x = 2200x
y = (36000 + 2200x + 20x2)

Solving
y = 36000 + 2200x + 20x2

Solving for variable 'y'.

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

Simplifying
y = 36000 + 2200x + 20x2

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