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Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: Show that for any integer n,the no. n^4-20n^2+4 is not a prime no.
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[Post New]13 May 2008 00:34:39 IST
    Subject: Show that for any integer n,the no. n^4-20n^2+4 is not a prime no.
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mukundmadhav (460)

Blazing goIITian

Olaaa!! Perrrfect answer. 74  [119 rates]
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n^4-4n^2+4-16n^2
(n^2-2)^2-(4n)^2

At least two factors..
 this reply: 9 points  (with 1 Olaaa!! Perrrfect answer.   in 3 votes )   [?]
 
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