also like this
a(a+1) (2a + 1) ------------- ---[a+1]([a+1]+1) (2[a+1]+1)
----------------+ (a+1)^2 =--------------------------
--------6 -------------------------------- 6
Hello, guenchy!
This seems to be an Inducation problem.
Something like . . .
. . Prove by induction that: .
You've verified ..
You assumed
You added to both sides:
. .
Now we want to show that the right side is the right side of ,
. . which is: .
Simplify the left side . . . It's just algebra, isn't it?
. .
Factor: .
. . . . . . There!