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 Posted: Tue Sep 29, 2009 4:37 pm
=w= Opens...
Nows...for homework...It's graphing, but I kinda have no idea what I'm doing...
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Posted: Tue Sep 29, 2009 4:39 pm
Well what are you supposed to be doing dear? *pours himself some tea*
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Posted: Tue Sep 29, 2009 4:46 pm
Piecewise functions...I've never heard of them before >w>
We did two examples in class, but they confuzzled me...could you explain? >.<" All I understand is that if it's (greater/less than or equal to) the dot is closed and it's it's just it's an open dot...
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Posted: Tue Sep 29, 2009 4:56 pm
Piecwise defined functions are basically functions that become different functions at certain intervals...
Example: y = [x^2 if x≤0, x if x>0]
would be a parabola on the left side of the y-axis and at zero, but the line y=x afterwards.
A good example of one is int(x). Check it out if you can find the int function on a graphing calc (or if you HAVE a graphing calc xD), it's perfect example of one.
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Posted: Tue Sep 29, 2009 5:06 pm
Pfft, no graphing calculator...need one though. For the example, these are the ones we had:
f(x)= 1 if x (less that/equal to) -2
f(x)=2+x if -2f(x)=2x if x>3
If I could find somewhere to use graphing paper online, this would be so much easier...=w= I hate graphing...
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Posted: Tue Sep 29, 2009 5:15 pm
Hang on, I'll work that one out for you on the computer.
You can just look up grid paper on google images and save it as a base...
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Posted: Tue Sep 29, 2009 5:18 pm
I could >.> But I'm lazy v.v
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Posted: Tue Sep 29, 2009 5:20 pm
Well I'm doing this one up for you, so you can see how it works.
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Posted: Tue Sep 29, 2009 5:24 pm
I know what the outcome for that one is; that's one of the examples we did in class. I just don't get how to do it...
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Posted: Tue Sep 29, 2009 5:25 pm
I'm sketching that out too Kaddy. And I'll point it out if you don't get it.
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Posted: Tue Sep 29, 2009 5:32 pm
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Posted: Tue Sep 29, 2009 5:52 pm
Sorry Kaddy, I couldn't figure out how to draw it... ;^^
I know how but I can't get it right.
I'll have to just explain it...
For the first part, it's from -∞ to and including -2, right? So you plot the graph f(x)=1 from the left up to that point and make a dark dot.
For the second part of that one, you plot f(x)=2+x from -2 to 3, with a cirle on the left end and a dot on the right.
For the last part, you plot f(x)=2x from 3 on with a circle on the left end. (make an arrow at the end)
Important points you need to know: Endpoints on all three graphs.
So for first part, it'd be the point (-2,1). For the second one it's the points (-2,0) and (3,5). For the third one, (3,6).
... You get it?
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Posted: Tue Sep 29, 2009 6:00 pm
-blinks- Surprisingly...I kinda do...
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Posted: Tue Sep 29, 2009 6:02 pm
Basically, you plot the graph it lists up to the x-value it lists, add a dot or a circle accordingly, then switch graphs. That makes more sense?
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Posted: Tue Sep 29, 2009 6:18 pm
Yeah, sorta ^^" I'll have to do it during health tomorrow...I don't have time to finish tonight...
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