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

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


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

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

Combine like terms: -80x + -40x = -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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