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moneyman: Master | Next Rank: 500 Posts; Posts: 468; Joined: Sat Mar 03, 2007 10:17 pm; Thanked: 5 times

by moneyman » Sun Oct 07, 2007 6:11 am

If R=1+2xy+x^2y^2 , what is the value of xy??

(1)R=0
(2)x>0

Maxx

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Source: Beat The GMAT — Problem Solving | Sun Oct 07, 2007 6:11 am

samirpandeyit62: Master | Next Rank: 500 Posts; Posts: 460; Joined: Sun Mar 25, 2007 7:42 am; Thanked: 27 times

by samirpandeyit62 » Sun Oct 07, 2007 7:23 am

If R=1+2xy+x^2y^2 , what is the value of xy??

(1)R=0
this is 1+2xy+x^2y^2 = (xy+1)^2

so (xy+1)^2 = 0

so xy =-1 SUFF

(2)x>0

(xy+1)^2 =R

here val cannot be determined coz R is not known

ans should be A

Regards
Samir

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