Question

Need Help! What is the derivative of e^-x?

Answer 1

I don't understand how it's -e^-x

Answer 2

\((e^u)' = e^u*(u)'\) ok??

Answer 3

mhm

Answer 4

yes, yes, yes, not mhm.... ok?
since \((e^x)' = e^x *(x)'\) but (x)' = 1, hence \((e^x)'=e^x\) ok??

Answer 5

Sure thing loser!

Answer 6

now, \((e^{-x})'= e^{-x}*(-x)'\)
and (-x)' =-1
hence it is \(-e^{-x}\) , clear??

Answer 7

yep, thanks