Chapter 5.3, Problem 2E

Find $f\left(1\right),f\left(2\right),f\left(3\right),f\left(4\right)$, and $f\left(5\right)$if $f\left(n\right)$is defined recursively by $f\left(o\right)=3$and for $n=0,1,2,\mathrm{...}$

a) $f\left(n+1\right)=-2f\left(n\right).$

b) $f\left(n+1\right)=3f\left(n\right)+7$.

c) $f\left(n+1\right)=f{\left(n\right)}^2-2f\left(n\right)-2.$

d) $f\left(n+1\right)=3^{f\left(n/3\right)}$.