Thread: power rule derivatives

ok I've done this one but cant seem to get the right answer, what am i doing wrong?

Find the derivative of the function below.


i got...2x-7x^(-2)

thanks

Originally Posted by mer1988

ok I've done this one but cant seem to get the right answer, what am i doing wrong?

Find the derivative of the function below.


thanks

what problems are you having with changing these forms to forms with powers? if you don't understand the manipulations i or some other users do, it is in your best interest to ask. based on the problems you've received help with thus far, you should not be having a problem with this.



now continue

Find the derivative of the function below. Assume that a and b are constants.


alright, this one i thought i did it right, however it what wrong, i got 56ab^6q...what did i do wrong?

Originally Posted by mer1988

Find the derivative of the function below. Assume that a and b are constants.


alright, this one i thought i did it right, however it what wrong, i got 56ab^6q...what did i do wrong?

If b is assumed constant, then why did you differentiate it? You cannot differentiate constants.

w = (8ab^7)q
dw/dq = 8ab^7

If y = 3x
What is dy/dx?

Originally Posted by mer1988

alright, this one i thought i did it right, however it what wrong, i got 56ab^6q...what the did i do wrong?

Please don't swear. We get 4th graders (and maybe some younger) here.

-Dan