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m25 Q22 pls explain

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Intern
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m25 Q22 pls explain [#permalink] New post 08 May 2011, 04:38
If function f(x) satisfies f(x^2) for all x , which of the following must be true?

A: f(4) = f(2)f(2)
B: f(16) - f(-2) =0
C: f(-2) + f(4) = 0
D: f(3) = 3f(3)
E: f(0) = 0

Correct answer is B, but i cant make out why though! thanks
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Re: m25 Q22 pls explain [#permalink] New post 09 May 2011, 03:55
anyone can help me over here?
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Re: m25 Q22 pls explain [#permalink] New post 09 May 2011, 23:43
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Hi,

This question has been discussed in detail here:
m25-71891.html

Please make sure you search the forum before posting a new thread. You can find a lot of GMAT Club Tests discussions in this thread:
gmat-club-tests-master-threads-all-tests-78599.html

Thank you for cooperation.
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Re: m25 Q22 pls explain [#permalink] New post 10 May 2011, 01:50
f(16) = f(4^2) = f[ (-2)^4]

where f(16) = f(-2) hence f(-2)-f(-2) = 0

Thus B.
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Re: m25 Q22 pls explain   [#permalink] 10 May 2011, 01:50
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