This problem was never taught in class so i am completly lost for this problem on my HW which is due tomorrow.
f(x) = 1-e^(-x) - e^(2x)
look ... you folks need to give directions so that others know what you are doing.
I'm assuming that you are trying to find the derivative of the function. Why do you think terr13 asked what the question was?
$\displaystyle f(x) = 1 - e^{-x} - e^{2x}$
learn this now ... $\displaystyle \frac{d}{dx} e^u = e^u \cdot \frac{du}{dx}$
it's just the chain rule for the natural exponential function.
so ...
$\displaystyle f'(x) = -e^{-x} \cdot (-1) - e^{2x} \cdot 2$
clean it up ...
$\displaystyle f'(x) = e^{-x} - 2e^{2x}$ ... you're done.
sorry to say this, but it looks like you're both in a world of $#!T ... you can't wait till the night before an exam to ask the most basic of questions regarding calculus.