max value of X

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Claret: Senior | Next Rank: 100 Posts; Posts: 97; Joined: Sat Jun 06, 2009 10:48 pm; Thanked: 4 times

by Claret » Tue Jun 09, 2009 3:27 pm

If X^4+Y^4=100, then the greatest possible value of X is between:
A. 0 and 3
B. 3 and 6
C. 6 and 9
D. 9 and 12
E. 12 and 15

Ans B

IMO it shud be A

any insights?

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Source: Beat The GMAT — Problem Solving | Tue Jun 09, 2009 3:27 pm

ssmiles08: Master | Next Rank: 500 Posts; Posts: 472; Joined: Sun Mar 29, 2009 6:54 pm; Thanked: 56 times

by ssmiles08 » Tue Jun 09, 2009 3:29 pm

If you make y = 0, to maximize x,
x will be a little bigger than 3 so it falls under [3 6]

(B)

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Claret: Senior | Next Rank: 100 Posts; Posts: 97; Joined: Sat Jun 06, 2009 10:48 pm; Thanked: 4 times

by Claret » Tue Jun 09, 2009 3:34 pm

yep got it ! thanks!

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