Consider the function y = -2 - 3cos(x +pi ). What effect does the 3 have?

A. Horizontal shift of y = -2 - cos(x + ) left 3 units.
B. Vertical shift of y = -2 - cos(x + ) down 3 units.
C. Vertical stretch of y = -2 - cos(x + ) by a factor of 3.
D. Horizontal shift of y = -2 - cos(x + ) right 3 units.

Question

Consider the function y = -2 - 3cos(x +pi ). What effect does the 3 have?

 		A.	Horizontal shift of y = -2 - cos(x + ) left 3 units.
 		B.	Vertical shift of y = -2 - cos(x + ) down 3 units.
 		C.	Vertical stretch of y = -2 - cos(x + ) by a factor of 3.
 		D.	Horizontal shift of y = -2 - cos(x + ) right 3 units.

campbell_st · Answer

3 is the amplitude so the vertical hight is increased by a factor of 3