Hey, there I have one quick question for now.. I'm in grade 12 calc and we're doing derivatives and have learned the power rule (its a nice shortcut) and i'm having trouble with this one problem:
Write an equation of a tangent to each of the curves at the given point:
P(3,9)
Heres what I did:
Then the derivative:
...Do I use the power rule on the inside brackets first? or distribute the 1/2 outside the brackets??
So my equation turns out to be
9x-y-18=0,
but the answer in the back of the book is 9x-2y-9=0
What am I doing wrong?