y=(200+20x)(400-20x)

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Solution for y=(200+20x)(400-20x) equation: 


Simplifying
y = (200 + 20x)(400 + -20x)

Multiply (200 + 20x) * (400 + -20x)
y = (200(400 + -20x) + 20x * (400 + -20x))
y = ((400 * 200 + -20x * 200) + 20x * (400 + -20x))
y = ((80000 + -4000x) + 20x * (400 + -20x))
y = (80000 + -4000x + (400 * 20x + -20x * 20x))
y = (80000 + -4000x + (8000x + -400x2))

Combine like terms: -4000x + 8000x = 4000x
y = (80000 + 4000x + -400x2)

Solving
y = 80000 + 4000x + -400x2

Solving for variable 'y'.

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

Simplifying
y = 80000 + 4000x + -400x2

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