so i need to sketch the following function:

f(x) = {3-x^2 0<=x<=2.1, x belong to R they are both f(x) - one function

f(x) = { 2x+5 2.1<=x, x belong to R

i know hot so sketch them but don't know what to do witch my domains, so on i should mark out them on my sketch .

Thx