anonymous
  • anonymous
PLEASE HELP y=2cos(x/4+pi)-1 find period, phase shift, and vertical shift
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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tkhunny
  • tkhunny
Well, do it. \(y = \cos(x)\) Amplitude: 1 Period: \(2\pi\) Phase Shift: 0 Vetical Shift: 0 \(y = 2\cos(x)\) Amplitude: 2 Period: \(2\pi\) Phase Shift: 0 Vetical Shift: 0 \(y = 2\cos(x) - 1\) Amplitude: 2 Period: \(2\pi\) Phase Shift: 0 Vetical Shift: -1 You do the rest.
anonymous
  • anonymous
sorry could you please explain further? i am confused @tkhunny
tkhunny
  • tkhunny
Yes I can, but you need to get unconfused. Each piece means something. I showed you the basic functino, the Amplitude, and the Vertical Shift (outside of the function argument). Now, you go find the Phase Shift and the Period. Hint, they are inside the function argument.

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anonymous
  • anonymous
period is pi/2? or 2pi. and phase shift is either pi/4 or 4 pi. i think. sorry i am trying to follow @tkhunny
tkhunny
  • tkhunny
It helps a LOT if you organize and keep track of everything. In my version, I added one thing in the function and changed one thing in the list. \(y=2\cos(x/4)−1\) Amplitude: 2 Period: \(8\pi\) Phase Shift: 0 Vetical Shift: -1 One more... Don't make me do all the work.
anonymous
  • anonymous
is it 1? i know im sorry @tkhunny
tkhunny
  • tkhunny
Seriously, stop apologizing and focus on what you are doing. This is really just a memorization problem. There isn't anything magic about it. \(y = a\cos(b(x-c))+d\) Either you know or you don't. Amplitude: a Vertical Shift: d Period: \(2\pi/b\) <== For cosine, anyway. Phase Shift: c Now, work inside that argument, \(x/4 + \pi\), and use the distributive property to factor out 1/4 and you should find the Phase Shift staring at you.
anonymous
  • anonymous
pi/4
tkhunny
  • tkhunny
Is that the answer or are you guessing? \(\dfrac{x}{4} + \pi = \dfrac{1}{4}(x + 4\pi)\)
anonymous
  • anonymous
i was guessing, but its 4pi
anonymous
  • anonymous
thank you so much
tkhunny
  • tkhunny
Now, you do another one. You made me do ALL of that one. Encourage me that youcan do it on your own.

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