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 Posted: Tue Sep 29, 2009 6:23 pm
Well, I hope you understand dear. ^^
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Posted: Mon Oct 05, 2009 5:29 pm
 The Angel...Open...
So...piecewise functions...=w= I kinda got lost after you explained it the first time... The Demon...
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Posted: Mon Oct 05, 2009 5:34 pm
I'll start with my basic explanation again.
For piecewise functions, there's multiple graphs assigned as one function... you just graph each piece as its function to the x-value it says it's to. So if it's f(x) for x<2, then you would graph f(x) for all x less than 2. That make sense?
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Posted: Mon Oct 05, 2009 5:40 pm
The Angel... That part does...but what about the other 1 to 2 pieces of the problem? Say, for example, if it says:
f(x) = 2 + x if -2 < x (Less than/equal to) 3
Those are the ones that really confuzzle Kaddy... The Demon...
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Posted: Mon Oct 05, 2009 5:43 pm
Well then you graph the segment of 2+x that's between -2 and 3. Circle the end that isn't equal to and dot the end that is.
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Posted: Mon Oct 05, 2009 5:48 pm
The Angel... But...=w= Kaddy doesn't quite know how to figure out where to put those on a graph...like, how do you figure out where to graph 2+x? The Demon...
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Posted: Mon Oct 05, 2009 5:50 pm
Well the long way is to plot the whole thing and then erase everything but the segment. If you can't figure out what I say next just do that.
the other is to plot endpoints. You can figure out what f(-2) and f(3) is, right? Well since 2+x is a line you can just connect them. It gives you x-values, plug them in.
For non-linear graphs, you just have to know the shape of the graph... you should memorize parent functions in class.
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Posted: Mon Oct 05, 2009 5:57 pm
The Angel... ...OH. The teacher taught us the long way...=w= Plotting the entire line then erasing...
-writing this down for future reference- The Demon...
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Posted: Mon Oct 05, 2009 6:00 pm
Well that one only works for linear graphs unless you know how to mess with parent functions. Ask your teacher about them if you haven't, you really should learn them.
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Posted: Mon Oct 05, 2009 6:02 pm
The Angel... Eh heh heh...^^" W-well...Kaddy gets nervous when talking to people...it's in my shy nature...so I don't normally ask question even if I don't understand... The Demon...
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Posted: Mon Oct 05, 2009 6:04 pm
Some, not all, of the parent functions. If you learn their shapes then you can transform them to make most other graphs. =w=
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Posted: Mon Oct 05, 2009 6:06 pm
The Angel... Okays...=w= We learned some of those back in Algebra two...I was so confuzzled and lost... The Demon...
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Posted: Mon Oct 05, 2009 6:08 pm
They're really really useful... just memorize them and know how to transform functions. =w=
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Posted: Mon Oct 05, 2009 6:13 pm
The Angel... Mmkay...=w= -saves picture- The Demon...
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Posted: Mon Oct 05, 2009 6:16 pm
Yeah, it helps. Like if it's 2x^2? Then you can just stretch the x^2 graph's shape. Adding on the outside moves it up, adding to the x on the inside moves it left or right (in the reverse of the sign). So doing something like 2(x-1)^2 + 3 becomes a lot easier, right?
Nothing wrong with using reference. We had a worksheet to look off of in class. =w=
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