Question

Which function has the widest graph?

A. y=2x^2 B. y=x^2 C. y=0.5x^2 D.y=-x^2
Do you have to graph each one to find the answer? ...?

Answer 1

You don't have to graph each of the answers, because you can just visualize the thing in your head.
B and D are the same, just facing different directions.
A is very narrow, since you multiply x by 2.
This means that the widest graph is C. y = 0.5x^2, because you divide x by 2.