Answer:
g(x) = (x/2)^2
Step-by-step explanation:
When we stretch the graph by a factor of 2, we essentially push the graph's lines outwards by a factor of 2. We can do this in the equation by multiplying the x inside the equation by 1/2, which makes the y-values of the graph lower per x-value. An important idea to note is that the x/2 must be inside the parathesis, as multiplying the whole equation by 1/2 would result in a different graph.