Posted by bana on August 12, 2002 at 07:35:04:
Hi,
I've got some more differentiations I don't understand how they got the answers.
1) f(x)=(2Inx)(x^3+3), f'(x)=6x^2Inx+2x^2+6/x
I tried using the log rule where Inx=1/x and the multiplying rule, but I got confused because of all the brackets. could u show me the main line of working please.
also,
2) y=(5-2x)^1/2
how do we approach this question? do we multiply (5-2x) by 1/2 and then take it to the power of -1/2?
thanx for your time.