Algebrahard · Past Paper
Factorize x^4 - 7x^2 + 1.
A(x^2+3x+1)(x^2-3x+1)
B(x^2-3x-1)(x^2+3x-1)
C(x^2+x+1)(x^2-x+1)
D(x^2-1)^2-5x^2
✓ Correct Answer: A — (x^2+3x+1)(x^2-3x+1)
(x^2+1)^2 - 9x^2 = (x^2+1-3x)(x^2+1+3x).
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✓ Correct Answer: A — (x^2+3x+1)(x^2-3x+1)
(x^2+1)^2 - 9x^2 = (x^2+1-3x)(x^2+1+3x).
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