precal
posted by Mike .
I do not understand when a function is even or not. I know the formula for telling them apart, but I do not understand it. Could someone break down the formula for me and explain it?
Thanks

http://www.purplemath.com/modules/fcnnot3.htm
It is rather easy:
If f(x)=f(x) it is even.
If f(x)=f(x) it is odd.