Recent content by justin335

  1. J

    What Is the Correct Derivative of the Function y(r) = (r^2 - 5.50r)exp(-r)?

    Oh ok, Ill have to reference my calc notes since I am pretty rusty. but I think I should get it now. Thanks for the help
  2. J

    What Is the Correct Derivative of the Function y(r) = (r^2 - 5.50r)exp(-r)?

    Thanks, would the derivative be e^-r(2r^3-16.5r^2+30.35r)? Thats what I got, and after subbing in r=5.5 again, I still get the answer wrong...
  3. J

    What Is the Correct Derivative of the Function y(r) = (r^2 - 5.50r)exp(-r)?

    Homework Statement Consider the following function of the variable r, r>/=0 y(r)=(r^(2)-5.50r)exp(-r) Find the value of the first derivative dy/dr at r=5.50 Homework Equations How do I solve this? I know its a simple derivative equation, but I can't seem to get it. I tried finding the...