book Maths Puzzle Numerical Ability

Here is the question:
2v(3v2-1) - (6-8v3+14v)+3

here is my attempt:
6v3-2v - 6+6v2+3
4v2-3=6v2

What is the rule with exponents ?

~Tabitha

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book Other Question

Can you pl;ease tell me if I have done this problem correctly? I just feel like is is off. The problem is as follows:

A sum of $2000 is split between two investments, one paying A Regualr polygon of n sides inscribed in a circle of radius r has 3r squared. What is the value of n?