Is r^4-29r^2+100 prime
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Is r^4-29r^2+100 prime

[From: ] [author: ] [Date: 11-11-29] [Hit: ]
......
I have been trying to factor this but I think it's prime? Thanks.

-
what adds to -29 and multiplies to 100
-25 and -4
since -25 + -4 = -29
& (-25)(-4) = 100

(r^2 - 25)(r^2-4)
which then is a difference of square:
(r-5)(r+5)(r-2)(r+2)

and yes, 29 is a prime number.
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keywords: 29,100,prime,Is,Is r^4-29r^2+100 prime
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