V=-[4x(20-2x)(20-2x)]

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Solution for V=-[4x(20-2x)(20-2x)] equation: 


Simplifying
V = -1[4x(20 + -2x)(20 + -2x)]

Multiply (20 + -2x) * (20 + -2x)
V = -1[4x(20(20 + -2x) + -2x * (20 + -2x))]
V = -1[4x((20 * 20 + -2x * 20) + -2x * (20 + -2x))]
V = -1[4x((400 + -40x) + -2x * (20 + -2x))]
V = -1[4x(400 + -40x + (20 * -2x + -2x * -2x))]
V = -1[4x(400 + -40x + (-40x + 4x2))]

Combine like terms: -40x + -40x = -80x
V = -1[4x(400 + -80x + 4x2)]
V = -1[(400 * 4x + -80x * 4x + 4x2 * 4x)]
V = -1[(1600x + -320x2 + 16x3)]
V = [1600x * -1 + -320x2 * -1 + 16x3 * -1]
V = [-1600x + 320x2 + -16x3]

Solving
V = -1600x + 320x2 + -16x3

Solving for variable 'V'.

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

Simplifying
V = -1600x + 320x2 + -16x3

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