y=(20-2x)(20-2x)x

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Solution for y=(20-2x)(20-2x)x equation: 


Simplifying
y = (20 + -2x)(20 + -2x) * x

Reorder the terms for easier multiplication:
y = x(20 + -2x)(20 + -2x)

Multiply (20 + -2x) * (20 + -2x)
y = x(20(20 + -2x) + -2x * (20 + -2x))
y = x((20 * 20 + -2x * 20) + -2x * (20 + -2x))
y = x((400 + -40x) + -2x * (20 + -2x))
y = x(400 + -40x + (20 * -2x + -2x * -2x))
y = x(400 + -40x + (-40x + 4x2))

Combine like terms: -40x + -40x = -80x
y = x(400 + -80x + 4x2)
y = (400 * x + -80x * x + 4x2 * x)
y = (400x + -80x2 + 4x3)

Solving
y = 400x + -80x2 + 4x3

Solving for variable 'y'.

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

Simplifying
y = 400x + -80x2 + 4x3

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