<![CDATA[Math Is Fun Forum / Derivatives]]>2006-01-03T07:09:44ZFluxBBhttp://www.mathisfunforum.com/viewtopic.php?id=2361<![CDATA[Re: Derivatives]]>you can use the formula d(a^x)/dx = a^x (ln a)

so will get ( 4^(-x + 3) (ln 4) (-1) )

]]>http://www.mathisfunforum.com/profile.php?id=24012006-01-03T07:09:44Zhttp://www.mathisfunforum.com/viewtopic.php?pid=22357#p22357<![CDATA[Derivatives]]>Find dy/dx if y = 4^(-x + 3)

I really don't know how to go about doing this.. never had to take the derivative of something with a variable as an exponent..