Question

What is the amplitude, period, and phase shift of f(x) = -4 sin(2x + π) - 5?

Answer 1

amplitude = -4; period = 2π; phase shift: x = -pi/2
amplitude = -4; period = π; phase shift: x = pi/2
amplitude = 4; period = π; phase shift: x = -pi/2
amplitude = 4; period = 2π; phase shift: x = pi/2

Answer 2

@ganeshie8 @Calliope @random231 @ranga

Answer 3

any ideas?

Answer 4

Either first or last i know its a shift to the right?

Answer 5

@random231

Answer 6

well can amplitude be negative?

Answer 7

No? Arent there certain limitations on Amplitude on graphs, and being negative is one? @random231

Answer 8

well amplitude is the measure of the maximum lateral displacement of a wave. so in my opinion an amplitude cannot have an negative sign!

Answer 9

@Mashy ! wave equation help!

Answer 10

I am so terrible at math! Lol

Answer 11

lol actually im not very sure! ive asked @Mashy to come here and im sure he can help.probably he is a bit busy!

Answer 12

but im pretty sure that amplitude wont be -ve

Answer 13

okay. so that narrows it down to one or the other answer

Answer 14

sin( pi + x) = -sin(x)

so u can reduce that equation to

f(x) = 4sin ( 2x) + 5

Answer 15

sorry i mean - 5*

Answer 16

Okay. So then its C?

Answer 17

well.. i think so.. i don't get the phase shift part though.. :D

Answer 18

Okay let me see if its right on the quiz...

Answer 19

Yes, its C! Thanks guys! @Mashy @random231

Answer 20

np!

Answer 21

np!