Question

order the group of quadratic functions from widest to narrowest graph y = 2x2, y = 4x2, y = 5x2

Answer 1

just let x =1 and -1

then
(1,2) (-1,2)
(1,4) (-1,4)
(1,5) (-1,5)

you can visualize the graph getting steeper and steeper (or narrower)