Derivative Problem (Quotient Rule Edition)

[Racerboy]

In trying to find the derivative of this function, I get stuck at the very end when I'm close to cancelling out stuff to simplify it to the final answer. Here's my work, I get down to the last step where the arrow and question mark are and I don't know what I did wrong. If the -2x^3/2 was not there it would work out.

sorry for bad quality

NOTE: You are not allowed to simplify the fraction by cancelling x², that's for part B which is shown above. You must use the quotient rule.

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[Oasis]

I can't respond to pm's, and I can help with this after classes tomorrow.

I'll suggest khan academy if you need help before then.

[Master Shadow Phoenix]

You have to simplify the x²√x by turning it into x^5/2. It should work out nicely.

[Doomonkey]