Test 3 Section 8 - #14 (page 547)

The best way to look at this question is probably to say that the y values in the graph are all going to be multiplied by 2. That's what they mean when they ask you to go from y = f(x) to y = 2f(x).

Note that you can sorta plug-in here to see what's going on. Say your original function was:

 f(x) = sin (x)

Graph that. Now with that graph still on screen, graph 2f(x):

2f(x) = 2[sin (x)]

See? It doubles the y values.

If you double all the y values, which graph will you end up with? Choice (D).