Answer:
Stretch function:
If a function y =f(x) ;
then a new function g(x) =c f(x) ,where c is constant , is a vertical stretch or vertical compression of the f(x)
- If c > 1, then the graph will be stretched.
- If 0<c<1; then the graph will be compressed
As per the statement:
Given the parent function:

then;
Vertically Stretch the parent function by a factor 5 > 1
then we get a new function;

Therefore, the transformation stretches the graph by a factor of 5.
As you can see the graph of these functions as shown below