an = n(n+2)
Substituting n = 1, 2, 3, 4, and 5, we obtain
a1= 1(1+2)=3
a2= 2(2+2)=8
a3= 3(3+2)=15
a4= 4(4+2)=24
a5= 5(5+2)=35
Therefore, the required terms are 3, 8, 15, 24, and 35.
\(f(x) = \begin{cases} x^2, & \quad 0≤x≤3\\ 3x, & \quad 3≤x≤10 \end{cases}\)
The relation g is defined by
\(g(x) = \begin{cases} x^2, & \quad 0≤x≤2\\ 3x, & \quad 2≤x≤10 \end{cases}\)
Show that f is a function and g is not a function.