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Old April 6th, 2004, 01:28 PM   #1 (permalink)
 
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Algebra 1 HELP!!!!!!

I just cant frickin figure this problem out and i have a ton of em due thursday can someone help me just figure one out then explain how you got the answer then i should be able to figure the rest out. here's the problem:

If f(x) = 3x, find the domain and range of function f.

Someone Please help!!!!!!

THANKS IN ADVANCE
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Old April 6th, 2004, 01:30 PM   #2 (permalink)
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i think f(x) = 3x is y=3x if that helps
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Old April 6th, 2004, 01:36 PM   #3 (permalink)
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i think the domain is x and the range is y so
domains : ranges
0 : 0
1 : 3
2 : 6
3 : 9

but not writen like that lol
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Old April 6th, 2004, 01:41 PM   #4 (permalink)
 
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The domain (x) and range (y) are both all reals because the function is defined everywhere. Use a graphing calculator for harder ones if you have one because it really helps.
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Old April 6th, 2004, 01:43 PM   #5 (permalink)
 
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so what your sayin is they are all real numbers????
and thanks boss_charger and stupidlikeaf0x i think i got it
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Old April 6th, 2004, 01:50 PM   #6 (permalink)
 
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Re: Algebra 1 HELP!!!!!!

Quote:
Originally posted by Bose
I just cant frickin figure this problem out and i have a ton of em due thursday can someone help me just figure one out then explain how you got the answer then i should be able to figure the rest out. here's the problem:

If f(x) = 3x, find the domain and range of function f.

Someone Please help!!!!!!

THANKS IN ADVANCE
f(x)=3x
Divide both sides by x
f=3
Now the range is the greatest number subtracted by the smallest number in a set of intergers.

Example:Find the range of these intergers [2,3,6,9,12,14]
14-2=12
Answer:The range of the intergers is 12

Although I am confused since there is only one number to represent f. So, I guess(but someone correct me if im wrong) the range would be 0.

After searching online for domain, it seems to apply only to linear equations(i.e. coordinate plane y=mx+b problems).

In New York Algebra and Geometry are mixed up into two 1.5 year courses that you take in 9-11 grade(although I started Math A in 8th since im accelerated) called Math A and Math B. I just started Math B after taking the Math A Regents in January so you may be learning stuff im not.
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Old April 6th, 2004, 01:57 PM   #7 (permalink)
 
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i don't think that's right, because f isn't a variable, it's a function, so you can't just divide both sides by x.
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Old April 6th, 2004, 02:01 PM   #8 (permalink)
 
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yea thats what i was thinkin
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Old April 6th, 2004, 02:03 PM   #9 (permalink)
 
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forget it then, i thought i knew what i was doing but obviously i haven't learned this stuff yet
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Old April 6th, 2004, 02:11 PM   #10 (permalink)
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F(x) is y

its the (Function of x ) or y
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Old April 6th, 2004, 02:32 PM   #11 (permalink)
 
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Domain= all the possible values for x
Range= all posible values for y

Domain = (-infinite, +infinite)
range = (-infinite, +infinite)

this is an easy one but sometimes x or y can't equal a certain number. I'd try to explain but I think I would just confuse you. Try hotmath.com or drmath.com
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Old April 6th, 2004, 03:02 PM   #12 (permalink)
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Its just all reals. simple as that. There is nothing that would make x or y undefined.
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Old April 6th, 2004, 04:51 PM   #13 (permalink)
 
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damn, hard algebra 1, i took this last yr and we never did this, now im in geo, alot easier, but wouldnt a fraction or a negative make it undefined, kinda off topic i guess
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Old April 6th, 2004, 05:00 PM   #14 (permalink)
 
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no, the graph of y = 3x is a diagonal line that goes to negative infinity on the left and positive infinity on the right, negative infinity on the bottom and postitive infinity on top, so as ppl have said its all reals, there are no restrictions.
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Old April 6th, 2004, 07:43 PM   #15 (permalink)
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Quote:
Originally posted by BZSentinel
Its just all reals. simple as that. There is nothing that would make x or y undefined.
Bingo, and trust me, breezed thru math 115 with an A
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Old April 6th, 2004, 09:24 PM   #16 (permalink)
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Woah Im in Algebra one and I havent learned this yet.... Im doin the whole y=mx+b thing. teh suck.
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Old April 6th, 2004, 09:41 PM   #17 (permalink)
 
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Oh, just wait til you get to Calculus.
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Old April 6th, 2004, 09:47 PM   #18 (permalink)
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Basic math ownz. Yea I took basic last year now I'm in algebra. We are doin stuff like:

7x= 3x
3x+2 2x+4x
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Old April 6th, 2004, 09:52 PM   #19 (permalink)
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f(x)=3x

the function of x is equal to 3 times x

the function of x can be reworded as 'y'

plug in your 'x' value into the equation, and you will come out with 3 times the 'x' value....whose product is your 'y' or function of x or f(x) value

simple...at least to me, honors pre-calculus sucks
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Old April 6th, 2004, 09:52 PM   #20 (permalink)
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Quote:
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Oh, just wait til you get to Calculus.
for real, i hate calculus.
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Old April 6th, 2004, 11:11 PM   #21 (permalink)
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eh.... AP calc isnt too bad. I'm gettin through with an A-

Anyone taking the AP test in may?
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Old April 7th, 2004, 02:51 PM   #22 (permalink)
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I'm in algebra 1 in 7th (instead of 8th) and next year AP honors geometry. I HATED f(x) still don't get that ****ing thing. Got my test back today from that ****, and got a 66/75. eh 88% B. lol
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Old April 7th, 2004, 07:56 PM   #23 (permalink)
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When you first learn algebra you learn the whole y=mx+b

f(x) just replaces the y so
f(x)=mx+b

Easy cheesy yo
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Old April 7th, 2004, 08:02 PM   #24 (permalink)
 
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We had a choice so i always did y=mx+b
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Old April 8th, 2004, 02:12 PM   #25 (permalink)
 
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Quote:
Originally posted by BZSentinel
eh.... AP calc isnt too bad. I'm gettin through with an A-

Anyone taking the AP test in may?
I took AP Calculus last semester so I forgot plenty of it. I'm still gonna take the AP test though since the school pays for it anyways.
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