y=(40-2x)(40-2x)x

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Solution for y=(40-2x)(40-2x)x equation: 


Simplifying
y = (40 + -2x)(40 + -2x) * x

Reorder the terms for easier multiplication:
y = x(40 + -2x)(40 + -2x)

Multiply (40 + -2x) * (40 + -2x)
y = x(40(40 + -2x) + -2x * (40 + -2x))
y = x((40 * 40 + -2x * 40) + -2x * (40 + -2x))
y = x((1600 + -80x) + -2x * (40 + -2x))
y = x(1600 + -80x + (40 * -2x + -2x * -2x))
y = x(1600 + -80x + (-80x + 4x2))

Combine like terms: -80x + -80x = -160x
y = x(1600 + -160x + 4x2)
y = (1600 * x + -160x * x + 4x2 * x)
y = (1600x + -160x2 + 4x3)

Solving
y = 1600x + -160x2 + 4x3

Solving for variable 'y'.

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

Simplifying
y = 1600x + -160x2 + 4x3

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