Suppose f(x) = x and g(x) = (3x)2. which statement best compares the graph
of g(x) with the graph of f(x)?
a. the graph of g(x) is horizontally stretched by a factor of 3.
b. the graph of g(x) is shifted 3 units to the right.
c. the graph of g(x) is vertically stretched by a factor of 3.
d. the graph of g(x) is horizontally compressed by a factor of 3