Re: need help with f o g
Mikish said:
I'm kinda bad at math and i need help with the following problem.
f(x)=x/(x-5) g(x)=3/x
find.. a) f o g b) f o f c) (f o g)(-2)
I haven't really been paying attention in class and just don't know how to even begin.
Thanks for any help!
I'll do another (similar) problem - this time pay attention:
f(x)=x/(x-a) g(x) = x[sup:2cjedwqt]2[/sup:2cjedwqt]
find.. a) f o g b) f o f c) (f o g)(-b)
\(\displaystyle f \, o \, g \, = \, f[g(x)] \, = \, \frac{g(x)}{g(x) - a} \, = \, \frac{x^2}{x^2 - a}\)
\(\displaystyle f o f \, = \, f[f(x)] \, = \, \frac {f(x)}{f(x) - a} \, = \, \frac {\frac{x}{x-a} }{\frac{x}{x-a} \, - \, a}\)
\(\displaystyle (f \, o \, g)(-b) \, = \, \frac{b^2}{b^2 - a}\)
Please show your work,indicating exactly where you are stuck - so that we know where to begin to help you.