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I have an expression:

$2a^3 / 3a^2 * 6a^5$

and my book gives the answer:

$4a^6$

I get where the $a^6$ is from but how is the $4$ worked out?

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    Thanks for the tip. It was written in the book exactly like that but with a "÷" instead of a /.2012-03-28

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Because its $2\cdot6/3 = 12/3=4$. That's without the $a$'s and its exponents.

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    Think my brain just automatically decided "You'll end up with an ugly fraction that you'll never turn in to 4 if I divide 2 by 3, find another way" haha. Thanks again!2012-03-28