Question

Describe the transformations required to obtain the graph of the function f(x) from the graph of the function g(x).
f(x) = 4 cos x; g(x) = cos x

Answer 1

vertical stretch by a factor of 4?

Answer 2

wait no horizontal?

Answer 3

Yes, it would be.
The range would be from [-1,1] to [-4,4]
Therefore it stretched vertically from a factor of 4.

Answer 4

oh ok lol thanks

Answer 5

It cant be horizontal because only the y coordinate are increasing.
If it was cos(x-pi/2) from cos(x), then it would have a horizontal or compressional factor.

Answer 6

No problem!