Question

Consider the function y= -2 - cos (x-pi). What effect does pi have on the basic graph?

A. Vertical shift down pi units

B. Horizontal shift left pi units

C. Vertical stretch by pi factor

D. Horizontal shift right pi units

**my answer: C. Vertical stretch by pi factor

is that right??

Answer 1

not too sure tho... :/ is that correct? :/

Answer 2

no

Answer 3

There is no stretch, as you didn't multiply the cos bit itself by anything.

Answer 4

However, there is a shift, as you added something to the cos... what did you add?

Answer 5

darn :(

then idk :( could y'all pls explain? i was kinda confused on this one :/

Answer 6

umm do u add pi? :/

Answer 7

In general, if you have some function f(x), then replacing x with x-h will shift the graph h units

So f(x) ---> f(x-h) means you're shifting h units horizontally

I'll leave it up to you to decide whether the shift is left or right

Answer 8

ohhh okay...

so lemme see if i remember this right...

+pi would be to the left

and -pi would be to the right

is that right??

so if it is, then would the answer be D. Horizontal shift right pi units ?? :)

Answer 9

yes

Answer 10

aweosme!!!! :D hehe thanks you guys!! :D