SOLUTION:

Question 88820:
Answer by malakumar_kos@yahoo.com(315) (Show Source): You can put this solution on YOUR website!

find the value of a[3] if: n=3 and a[n]=2(n^3-3)
a(n) = 2(n^3-3)
a(3) = 2(3^3-3)
= 2(27-3)
= 2(24)
= 48