Where did this y^4 come from?

Doing my calc work and there is a problem that I can't figure out where an extra factor of y came from. Should this value not be y^3? The book says y^4 and I can't figure out why. I get everything else, except this extra factor of y.
(The y has an arrow above it)

http://tinypic.com/r/2zgg0vm/6

Thanks!

Jacinta2013-03-27T14:26:42Z

Favorite Answer

They've multiplied the fraction immediately preceding the one you've indicated by y top and bottom.

This gives them an easy way to cancel the y^3's at the right-hand end of that particular fraction.

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