# Math Help - Differentiate 1 / (t+3e^t)

1. ## Differentiate 1 / (t+3e^t)

By using the quotient rule, I get -3e^t for the numerator.
The problem is the denominator: (t+3e^t)^2

I don't believe I'm foiling the denominator correctly.

2. $\left(\displaystyle\frac{1}{t+3e^t}\right)'=-\displaystyle\frac{(t+3e^t)'}{(t+3e^t)^2}=-\displaystyle\frac{1+3e^t}{(t+3e^t)^2}$