# Homework Help: Short Parabola Question

1. Jan 30, 2005

### tempeste

http://img158.exs.cx/img158/5127/prob9cx.jpg

2pi/3 the period right?

2. Jan 30, 2005

### da_willem

$$3sin(2\pi /3)-4=-3.89...$$

It's not even a function (or a pretty boring one), it's a number And why do you associate a sine with a parabola?

3. Jan 30, 2005

### tempeste

I accidently made the assumption is was a parabola because the question asks for
amplitude, period, phase shift, domain, range, and vertical shift (but I know you can do this for a sine graph to)

Do you know how to graph it on a graphing calculator? I do not recall how to solve this type of problem =(

4. Jan 30, 2005

### da_willem

Well as I said it's a pretty boring function, it's a number. It's just a straight horizontal (if you plot y on the vertical axis) line throught the point $$y=3sin(2\pi /3)-4=-3.89...$$. I'm not sure it's meaningful to assign a period to it as it's not periodic.

5. Jan 30, 2005

### tempeste

there must be a mistake in the question, I am sure the book does not want us to graph a straight line over one full cycle?

I think it should be 3sin(x (not 0) - 2pi/3) -4
That would make much more sense

Thanks for your help will

Last edited: Jan 30, 2005