v(x)=x(15-2x)(21-2x)

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Solution for v(x)=x(15-2x)(21-2x) equation: 


Simplifying
v(x) = x(15 + -2x)(21 + -2x)

Multiply v * x
vx = x(15 + -2x)(21 + -2x)

Multiply (15 + -2x) * (21 + -2x)
vx = x(15(21 + -2x) + -2x * (21 + -2x))
vx = x((21 * 15 + -2x * 15) + -2x * (21 + -2x))
vx = x((315 + -30x) + -2x * (21 + -2x))
vx = x(315 + -30x + (21 * -2x + -2x * -2x))
vx = x(315 + -30x + (-42x + 4x2))

Combine like terms: -30x + -42x = -72x
vx = x(315 + -72x + 4x2)
vx = (315 * x + -72x * x + 4x2 * x)
vx = (315x + -72x2 + 4x3)

Solving
vx = 315x + -72x2 + 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 = 315 + -72x + 4x2

Simplifying
v = 315 + -72x + 4x2

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