3. For n=1:
From (1) and (2)
1. Show that f(x) is an even function where:
2. Evaluate lim x--> 5 [sqrt(x) - sqrt(5)]/[x-5]
3. Prove, by induction, that a^n - b^n is divisible by a-b for all positive integer values of n.
ARGH i'm so stupid. Could some1 plz help me with these questions???