Thread: 2 Sin/ Cos Probelms

1. y=-9cosx+5

Amplitude:?
Period:?
Phase Shift:?
Range:?

2.-15sin[5(x+(pi/3))]+3

Amplitude:?
Period:?
Phase Shift:?
Range:?

Thanks


My Answers are:

1.
Amplitude: 9
Period: 2pi
Phase Shift: 0
Range: [-4,14]

2.
Amplitude:15
Period: (2pi/5)
Phase Shift: (-pi/3)
Range: [-12,18]

Originally Posted by qbkr21

1. y=-9cosx+5

Amplitude:?
Period:?
Phase Shift:?
Range:?

Amplitutde is 9 even though the number in front is -9, you take absolute value.

The period is

There is no phase shift.

The minimum value occurs when, , thus, -9(1)+5=-4
The maximum value occurs when thus, -9(-1)+5=14
The range is,


Similar idea for each one.

Ok so my answer were correct?

Originally Posted by qbkr21

Ok so my answer were correct?

Everything's fine except for the phase shift in the second problem. What happened to the 5 in the function?

-Dan