we have the function

Find out the value of function g(x) for each value of x
so
For x=-1
substitute the value of x in the function g(x)

For x=0

For x=1

For x=2

using a graphing tool
plot the different points
so
we have
(-1,4)
(0,6)
(1,9)
(2,13.5)
see the attached figure to better understand the problem
please wait a minute