Thread: Equation of the normal line?

Find the equation of the normal line to the graph of y=√ 8x at x=2.
The part that I'm stuck at is...how do you get the derivative of y=√ 8x? The book gives me 4 / √ 8x for the derivative. How do you get that?

I know how to do the rest, just not how to take the derivative of that type of function

Thanks so much

Their notation is very messy, in my opinion.



Now apply the power rule. If you prefer, you can go straight into the power rule, as we have and the is just a constant. Either way, I'd avoid their notation if possible; I get an answer of which is equivalent to theirs, although I've simplified slightly.