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Number Series: Series Pattern

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I saw a board on a math website that said to solve this if you are genius:

8=56
7=42
6=30
5=20
3=?

I see there are several ways to approach this and I have come up with 9 (my best guess), 6, and 14. What answer is most correct and why? Please provide a detailed explanation.

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Solution Summary

This solution solves for the pattern of a series of equations.

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I believe most people will guess the following pattern:
line 1: 56 = 8*(8-1)
line 2: 42 = 7*(7-1)
line 3: 30 = 6*(6-1)
line 4: 20 = 5*(5-1)

Then they assume a fifth line: 4=12 (i.e., 12=(4*(4-1)) is omitted.

The last ...

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