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**Jacobpm****Guest**

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..

Thanks for the help in advance.

**hellrom****Member**- Registered: 2006-01-02
- Posts: 2

you can use the formula d(a^x)/dx = a^x (ln a)

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

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