Problem involving derivative and left-hand limit

1. Oct 10, 2013

Loopas

This is from an online homework that's due in an hour. This question has been bothering me all day and I'm convinced that there's a problem with the website.

It's asking for the expression that's used to find the left-hand limit of the derivative, f'(0).

It won't take 2x+6 as the answer... Am I missing something or is the website just screwed up?

I attached a picture of the problem. Help fast!

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2. Oct 10, 2013

klondike

Do you remember the derivative of of $$x^n$$?

3. Oct 10, 2013

Loopas

Wouldn't that be n?