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# ps OG 368

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Manager
Joined: 05 Oct 2005
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ps OG 368 [#permalink]  27 Nov 2005, 09:05
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I f x ^4 + y ^4 = 100
Then the greatest value of x is between

0 and 3
3 and 6
6 and 9
9 and 12
12 and 15

plz how would you approach this one ? thru approximation ?

thanks
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Intern
Joined: 10 Jun 2005
Posts: 5
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here in this question both x^4 and y^4 are +ve
so minimum value is 0
so for x to be maximum x^4 should be maximum => y^4 = 0
So max(x^4) = 100
=>max(x^2) = 10

=>max value of x will be 3.XX
so value is between 3 and 6

Whats the Ans
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