Evaluate the function

Question

f(x)={9x+5, x<0
{9x+6, x>(or equal to)0

Determine its domain and range using interval notation?

I believe the domain is (-infinity,infinity) but how would I find the range?

Answer 1

also -oo to +oo

Answer 2

the interval (5,6] is excluded from the range, because of the jump at x=0.