Posted by tim on November 10, 2002 at 20:58:04:
In Reply to: hints posted by T.Gracken on November 10, 2002 at 19:27:19:
: you must use a combination of rules.
: start with the product rule (since you are multiplying things), then use power rule.
: note that you have x^3(2x-5)^4
: so you have a product of x3 and (2x-5)4
: so Dx[x^3(2x-5)^4]
: = x^3*Dx[(2x-5)^4] + (2x-5)^4*Dx[x^3]
: where Dx[y] means the derivative of y with respect to x.
I can get that far. then im stuck. when i check it on the calculator i get x²(2x-5)^3(14x-15).
and i can't get that answer.