I really need help with this problem, very lost!

Given a polynomial function f(x), describe the effects on the y-intercept, regions where the graph is increasing and decreasing, and the end behavior when the following changes are made. Make sure to account for even and odd functions.

When f(x) becomes f(x) − 3
When f(x) becomes −2 • f(x)

Question

I really need help with this problem, very lost!

Given a polynomial function f(x), describe the effects on the y-intercept, regions where the graph is increasing and decreasing, and the end behavior when the following changes are made. Make sure to account for even and odd functions.

When f(x) becomes f(x) − 3 
When f(x) becomes −2 • f(x)

myininaya · Answer

Well pretend you have 
f(x)=x
and so
g(x)=x-3

what happened to the y-intercept?
has where the function is increasing or decreasing changed?
and what about has the end-behavior changed?
That is I'm asking you to compare:
|dw:1435552806201:dw|
to
|dw:1435552827878:dw|