Let y= -sqrt(18)sin(7pi x-3e^-1)

Question

1. What is the amplitude?
2. What is the period?
3. What is the phase shift?

Answer 1

to find the phase shift set 7∏x-3e^(-1)=0 and solve for x

7∏x=3e^(-1)

7∏x=3/e

x=(3/e)÷(7∏)

x=(3/e)(1/7∏)

x=3/7∏e