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December, 2024

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Are you good at math?

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ReignMan
Posts: 1852 - Karma: 226
I have a quiz on functions tomorrow. I need help making sense of how to find the domain and range of it all. major + k if you can help me out.
Nov 29 2010 7:18PM
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maximiliaan
Posts: 7711 - Karma: 2,857
mweh
Nov 29 2010 7:20PM
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Seth.S
Posts: 630 - Karma: 1,631
domain is usually the Y on a graph and range is the X
Nov 29 2010 7:20PM
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steezenskis
Posts: 1044 - Karma: 31
wow, functions you must be like 10
Nov 29 2010 7:23PM
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ReignMan
Posts: 1852 - Karma: 226
so thats backwards. but some how, this made it click. WTF just happened. i dont even know how to act. you made me question you and some how that made it click.
Nov 29 2010 7:23PM
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ReignMan
Posts: 1852 - Karma: 226
and no I am a sophmore and am a year ahead. This is all aplying to trig and pre cal.
Nov 29 2010 7:24PM
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T.DUDE
Posts: 1681 - Karma: 129
like the kid said above

Domain: all "X" values
Range: all "Y" values

just in case you didn't know, a line is a function if there is exactly ONE "Y" value for every "X" value

also, use the pencil test..put your pencil vertically on the left side of the graph and move it to the right… if the graph crosses the pencil in to spots when you stop the pencil at any time, then it is NOT a function.
Nov 29 2010 7:24PM
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ORDEAL
Posts: 6386 - Karma: 75
No. Divide 3.14159 by 0
Nov 29 2010 7:25PM
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T.DUDE
Posts: 1681 - Karma: 129
I guesss this is the opposite of what the kid up there said..i am right though.. i know it.
Nov 29 2010 7:25PM
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theblackrod
Posts: 2162 - Karma: 575
domain is all inputs of X and the range is the values at each x, or the max and min Y value
Nov 29 2010 7:25PM
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katie.
Posts: 2833 - Karma: 874

if youre looking at your average parabola, there are infinite X values (ie. Domain {xER})

usually with parabolas, there is one restriction on y - its minimum or maximum value (ie. Range {yER, y>8} or something like that)

i dunno which types of functions you're doing, but root functions have a restriction on X an Y, reciprocial functions have restrictions where x=/=0 and y=/=0, and absolute functions have the same restrictions as parabolas.

lines do not have restrictions unless they have a defined starting point.

Nov 29 2010 7:27PM
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Anathema
Posts: 21048 - Karma: 5,062
i thought math was about numbers? now there's LETTERS TOO?!?!?!?!!
Nov 29 2010 7:28PM
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Seth.S
Posts: 630 - Karma: 1,631
yeah you are i did fuctions last year in algebra and dont remeber functions very well... the thing i dont get is proofs for geometry
Nov 29 2010 7:29PM
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Seth.S
Posts: 630 - Karma: 1,631
glad i could somehow help
Nov 29 2010 7:29PM
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katie.
Posts: 2833 - Karma: 874
i might be a huge math nerd. i enjoyed helping
Nov 29 2010 7:30PM
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