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

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


Simplifying
S = (20 + -2x)(40 + -2x)

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

Combine like terms: -40x + -80x = -120x
S = (800 + -120x + 4x2)

Solving
S = 800 + -120x + 4x2

Solving for variable 'S'.

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

Simplifying
S = 800 + -120x + 4x2

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