algebra

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sud21: Master | Next Rank: 500 Posts; Posts: 344; Joined: Sat Nov 12, 2011 3:21 am; Thanked: 1 times; Followed by:2 members

by sud21 » Thu Jan 12, 2012 4:58 am

(r^2-s^2)^2=?
1). 4r^2s^2=120
2). (r^2+s^2)^2=4r^2s^2

Source: Beat The GMAT — Data Sufficiency | Thu Jan 12, 2012 4:58 am

mankey: Legendary Member; Posts: 627; Joined: Thu Jun 23, 2011 9:12 am; Thanked: 4 times; Followed by:1 members

by mankey » Thu Jan 12, 2012 10:13 am

Rearranging B gives (r^2-s^2)^2=0

So, B.

What is the OA?

Thanks.

chufus: Master | Next Rank: 500 Posts; Posts: 102; Joined: Thu Jul 21, 2011 2:22 am; Location: Lahore, Pakistan; Thanked: 4 times; Followed by:1 members

by chufus » Thu Jan 12, 2012 10:21 am

Touche ! B it should be !

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