Question

Please help:

What are the Amplitude, Period, Midline, and Phase Shift for f(x) = -5 cos(3x - pi) + 2

Answer 1

The amplitude is 5. The negative sign in front of it just means that it goes down to -5 first instead of up to +5 like it would if it wasn't negative. Anyway, the period of it is
`(2 \pi )/(3)`, and the phase shift is
`( \pi )/(3)`. The midline is the vertical shift, which is 2.