Question

F(1)=3f(1)=3 and f(n)=2f(n-1)+3

f(n)=2f(n−1)+3

then find the value of f(3)

Answer 1

f(3)=21

Explanation:

f(1)=3

f(n)=2f(n-1)+3

n=2

f(2)=2f(2-1)+3

f(2)=2f(1)+3

f(2)=2*3+3

f(2)=6+3

f(2)=9

n=3

f(3)=2f(3-1)+3

f(3)=2f(2)+3

f(3)=2*9+3

f(3)=18+3

f(3)=21