# If  f(x) = 3x  then find f(t), f(2t) and f(t+2)?

$f \left(x\right) = 3 x$
(i) $\setminus \setminus f \left(t\right) \setminus \setminus \setminus \setminus \setminus \setminus = 3 t$
(ii) $\setminus f \left(2 t\right) \setminus \setminus \setminus \setminus = 3 \left(2 t\right) = 6 t$
(iii) $f \left(t + 2\right) = 3 \left(t + 2\right) = 3 t + 6$