# Math Help - Some derivative questions

1. ## Some derivative questions

2. Originally Posted by redraider717
recall: $\frac d{dx}e^{kx} = ke^{kx}$ for k a constant

recall: $\frac d{dx}a^x = a^x \ln a$ for $a \in \mathbb{R}, a>0$

you will also need the product rule here, since you have a product of functions

$\frac d{dx}f(x)g(x) = f'(x)g(x) + f(x)g'(x)$

3. We don't need the product rule here, since $3^x\cdot5^x=(15)^x.$

4. Thanks again Jhevon for all the help you've given me over the last couple of weeks. I had my exam today and I'm pretty sure I got a 100 on it.