Graph the exponential function. g(x)=1/2(2)^2. To graph the function, plot the points on the graph with x -values −2 , −1 , 0 , 1 , and 2.

I think you might mean:

g(x)  = (1/2)x^2

If so, here's the graph and associated points :    https://www.desmos.com/calculator/qtxcntuqz3