# 2 quick algebra questions

Discussion in 'Community Discussion' started by rdf8585, Jul 10, 2006.

1. ### rdf8585 macrumors regular

Joined:
Feb 15, 2006
#1
1. Does y = |x|-5 and y= |2x|-5 have the same domain and/or range?

2. Does y = -x^2+5 and y = -1/2x^2+5 have the same domain and/or range?

Domains and ranges totally befuddle me, and I don't have a graphing calculator, which some people said might help.

Joined:
Sep 29, 2005
Location:
WI
#2
3. ### Josh macrumors 68000

Joined:
Mar 4, 2004
Location:
State College, PA
#3
An easy and basic way to remember things...

domain: the intervals of the X-axis the equation occupies (how "long" the total graph would go horizontally left and right).

range: the intervals of the Y-axis the equation occupies (how "tall" the total graph would be)

4. ### Stinkythe1 macrumors regular

Joined:
Mar 30, 2005
#4
It's amazing how quick you can forget this stuff. I had college algebra 2 years ago and I'm clueless as to how to start on that problem...

Oh well.

5. ### swiftaw macrumors 603

Joined:
Jan 31, 2005
Location:
Omaha, NE, USA
#5