1. The problem statement, all variables and given/known data If the slope of the curve y=−2kx^3+4kx at x=3 is 25, what is the value of k? 2. Relevant equations f(x)=xn f'(x)=nxn-1 3. The attempt at a solution y=f(x) f(x)=-2kx3+4kx f'(x)=-6kx2+4k x=3 f'(3)=-50k -50k = 25 -k=1/2 k=-1/2 Did I do it right?