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Diperoleh nilai:
p = -5, dan p = 1
x^4 + px^3 - 3x^2 + (p^2+1)x - 16 = 0
2^4 + (2^3)p - 3(2^2) + (p^2+1)2 - 16 = 0
16 + 8p - 12 + (2p^2 + 2) - 16 = 0
8p+2p^2 -12 + 2 = 0
8p+2p^2 -10 = 0
p^2 +4p - 5 = 0
(p - 1) (p + 5) = 0
p-1 = 0 , p+5 = 0
p = 1 , p = -5
Jadi P= 1 atau -5