Question

If a1 = 4 and an = (an-1)^2 + 3 then find the value of a4.

Answer 1

9514 1404 393

Answer:

a4 = 132,499

Explanation:

Use the recursive relation repeatedly.

a1 = 4

a2 = (a1)² +3 = 4² +3 = 19

a3 = 19² +3 = 364

a4 = 364² +3 = 132,499