Algebrahard · Past Paper
Factorize x^4 + 64.
A(x^2+4x+8)(x^2-4x+8)
B(x^2+8)^2
C(x^2-8)^2
D(x+4)^2(x-4)^2
✓ Correct Answer: A — (x^2+4x+8)(x^2-4x+8)
(x^2)^2 + 8^2 = (x^2+8)^2 - 16x^2 = (x^2+8-4x)(x^2+8+4x).
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✓ Correct Answer: A — (x^2+4x+8)(x^2-4x+8)
(x^2)^2 + 8^2 = (x^2+8)^2 - 16x^2 = (x^2+8-4x)(x^2+8+4x).
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