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The expressions does not have rational factors but it does have real factors, so it is not prime. Furthermore, the value of the expression will be prime for some values of x and not for others.
Answer : 12
(5x 2 - 8x + 1) + (2x 2 - 4x - 11)
9x2 - 6xy + y2 - 81 = (3x - y)2 - 81 = (3x - y - 9)*(3x - y + 9)
the answer is (3x-2)(9x squared+6x+4)
f(x) = 3x2 + 5x + 2fprime(x) = 6x + 5