# Writing a function without negative powers

• Sep 25th 2010, 02:56 AM
Glitch
Writing a function without negative powers
So I have a function $\displaystyle f(x) = e^{-x^2}$. I want to write this without a negative exponent. How would I do this? I know how to do it with integer exponents, but I'm not sure when they're variables. Thanks!
• Sep 25th 2010, 03:02 AM
mr fantastic
Quote:

Originally Posted by Glitch
So I have a function $\displaystyle f(x) = e^{-x^2}$. I want to write this without a negative exponent. How would I do this? I know how to do it with integer exponents, but I'm not sure when they're variables. Thanks!

Do you know that $\displaystyle \displaystyle a^{-m} = \frac{1}{a^m}$ ....? Why would you doubt using this in your current question?
• Sep 25th 2010, 03:07 AM
Glitch
That's what I thought, but this text says this:

$\displaystyle \frac{x}{e^{x^2}}$

Actually, I'm an idiot, just realised that the function was $\displaystyle xe^{-x^2}$ >_<

That explains why I was confused!