Answer:
Last option: 3
Step-by-step explanation:
The following are some transformations for a function f(x):
1) If and , then this function is stretched vertically by a factor of "a".
2) If and , then this function is compressed vertically by a factor of "a".
Therefore, given the function , we can observe that the factor "a" is:
Then:
This means that then this function is stretched vertically by a factor of 3.
Therefore, the scaling factor is 3.