Ok, so how to do we use the quotient rule to show that this function

$\displaystyle g(x) = \frac{e^{(20-x/36)}}{(5+x)^2}$ ................ $\displaystyle (x>-5)$

has derive.

$\displaystyle k '(x) = \frac{(14+5x-x^2)e^{x(20-x/36)}}{18(5+x)^3}$

Thank you