This is kind of confusing For f(m)=7^4-4m^2+8,
find f '(x), f ''(x) and f '''(x). I'm not sure I understand. Isn't the derivative of a constant 0? I don't see how this can get down to f '''(x).

Question

This is kind of confusing> For f(m)=7^4-4m^2+8, 
find f '(x), f ''(x) and f '''(x). I'm not sure I understand. Isn't the derivative of a constant 0? I don't see how this can get down to f '''(x).

anonymous · Answer

find the limit if it exists.$$\lim (x,y) \frac{ xy-3 }{ x^{3}+y^{3} }$$

wesdg1978 · Answer

I've never seen a problem set up that way, so I don't understand lim (x,y)

anonymous · Answer

anybody else know the answer for this???

anonymous · Answer

wesdg, you'll have
$$f'(m)=-8m$$
$$f''(m)=-8$$
$$f'''(m)=0$$

wesdg1978 · Answer

Ok, that's what I was thinking, but it seemed to simple to be right. thanks