V=(20-2x)(40-2x)5

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Solution for V=(20-2x)(40-2x)5 equation: 


Simplifying
V = (20 + -2x)(40 + -2x) * 5

Reorder the terms for easier multiplication:
V = 5(20 + -2x)(40 + -2x)

Multiply (20 + -2x) * (40 + -2x)
V = 5(20(40 + -2x) + -2x * (40 + -2x))
V = 5((40 * 20 + -2x * 20) + -2x * (40 + -2x))
V = 5((800 + -40x) + -2x * (40 + -2x))
V = 5(800 + -40x + (40 * -2x + -2x * -2x))
V = 5(800 + -40x + (-80x + 4x2))

Combine like terms: -40x + -80x = -120x
V = 5(800 + -120x + 4x2)
V = (800 * 5 + -120x * 5 + 4x2 * 5)
V = (4000 + -600x + 20x2)

Solving
V = 4000 + -600x + 20x2

Solving for variable 'V'.

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

Simplifying
V = 4000 + -600x + 20x2

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