V(X)=(20-2X)(40-2X)(X)

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


Simplifying
V(X) = (20 + -2X)(40 + -2X)(X)

Multiply V * X
VX = (20 + -2X)(40 + -2X)(X)

Reorder the terms for easier multiplication:
VX = X(20 + -2X)(40 + -2X)

Multiply (20 + -2X) * (40 + -2X)
VX = X(20(40 + -2X) + -2X * (40 + -2X))
VX = X((40 * 20 + -2X * 20) + -2X * (40 + -2X))
VX = X((800 + -40X) + -2X * (40 + -2X))
VX = X(800 + -40X + (40 * -2X + -2X * -2X))
VX = X(800 + -40X + (-80X + 4X2))

Combine like terms: -40X + -80X = -120X
VX = X(800 + -120X + 4X2)
VX = (800 * X + -120X * X + 4X2 * X)
VX = (800X + -120X2 + 4X3)

Solving
VX = 800X + -120X2 + 4X3

Solving for variable 'V'.

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

Divide each side by 'X'.
V = 800 + -120X + 4X2

Simplifying
V = 800 + -120X + 4X2

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