[munazic483]

As I predicted, I'm well on the way to asking a whole heap of questions about C3. This time I'm having difficult with functions:

f(x)=x-2
g(x)=5/(x+2)

h=fg

so
a) find h(x)
b) find h^-1

I got h(x) to be 5/(x+2) -2 and x can't equal -2, however I then couldn't do part b) as I kept ending up with either an xy or an x/y when trying to get y by itself.

Thanks in advance

[mathz]

(y+2)(x+2)=5

x+2=5/(y+2)

....

[munazic483]

(Original post by mathz)
(y+2)(x+2)=5

x+2=5/(y+2)

....

And with hindsight, it's actually really obvious...

Thanks though, fancy sitting the exam with me and pointing out all the things I miss?