book Maths Puzzle Numerical Ability

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

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16a^2b-20ab+24ab^2
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5ab
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