V(x)=(21-2x)*(21-2x)*x

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Solution for V(x)=(21-2x)*(21-2x)*x equation: 



(V)=(21-2V)(21-2V)*V

We move all terms to the left:

(V)-((21-2V)(21-2V)*V)=0

We add all the numbers together, and all the variables

V-((-2V+21)(-2V+21)*V)=0

We multiply parentheses ..

-((+4V^2-42V-42V+441)*V)+V=0



We calculate terms in parentheses: -((+4V^2-42V-42V+441)*V), so:

(+4V^2-42V-42V+441)*V

We multiply parentheses

4V^3-42V^2-42V^2+441V

We do not support eVpression: V^3

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