Hello. I need help graphing y = 4 sin (-2x). Also what is the amplitude, period and phase shift. Thank you!
If you have a sinusoid in the form of , then the amplitude is , the period is , and the phase shift is . ( represents the vertical translation.)
So in your problem the amplitude is 4, the period is π, and the phase shift is 0. In addition, since there is a negative sign in front of the 2, there is a reflection on the x-axis.