s=x(20-2x)(x(40-2x))

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Solution for s=x(20-2x)(x(40-2x)) equation: 


Simplifying
s = x(20 + -2x)(x(40 + -2x))
s = x(20 + -2x)((40 * x + -2x * x))
s = x(20 + -2x)((40x + -2x2))

Multiply (20 + -2x) * (40x + -2x2)
s = x(20(40x + -2x2) + -2x * (40x + -2x2))
s = x((40x * 20 + -2x2 * 20) + -2x * (40x + -2x2))
s = x((800x + -40x2) + -2x * (40x + -2x2))
s = x(800x + -40x2 + (40x * -2x + -2x2 * -2x))
s = x(800x + -40x2 + (-80x2 + 4x3))

Combine like terms: -40x2 + -80x2 = -120x2
s = x(800x + -120x2 + 4x3)
s = (800x * x + -120x2 * x + 4x3 * x)
s = (800x2 + -120x3 + 4x4)

Solving
s = 800x2 + -120x3 + 4x4

Solving for variable 's'.

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

Simplifying
s = 800x2 + -120x3 + 4x4

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