hello, i just wanted to know how to find the equation of the tangent line for f(x)=x^4-x^3 at the point x=1.2.  what code would be used?  thank you very much in advance.

hello, im just trying to do a solve function in  maple 13 for this equation.....1.5=2.4713(1+e^-t+1)*(1-1.23934*e^-0.2145(t+1))^3

I want to solve for T but it keeps telling me that the solutions are lost when i try to solve, please helppppp.  im freaking out here.  and the "e's" in the equation are the exponent function, not another variable.