x4+x2-20
A (x²-5) (x²+4)
B (x²+5) (x²-4)
C (x²-5) (x²-4)
D (x²-5) (x²+4)
Correct Answer: Option B
x4+x2-20= x4+5x2-4x²-20= x²(x²+5) - 4(x²+5)∴(x²+5)(x²-4)
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