what are the domain and range of y=8(3)^x

y = 8*(3^x)

recall that domain is the set of all possible values of x,, here there is no restriction for x thus
the domain is all real numbers.
recall that range is the set of all possible values of y,, here note that y cannot be negative since the term 3^x is always positive and y will only approach a very small positive number (if x approaches a very large negative number) but NEVER equal to zero, thus
the range is greater than zero or in symbols,
(0, (+)infinity)

hope this helps~ :)