Algebrahard · Past Paper
Factorize a^4 + a^2b^2 + b^4.
A(a^2+ab+b^2)(a^2-ab+b^2)
B(a^2+b^2)^2
C(a+b)^2(a-b)^2
D(a^2+2ab+b^2)(a^2-2ab+b^2)
✓ Correct Answer: A — (a^2+ab+b^2)(a^2-ab+b^2)
Add and subtract a^2b^2: (a^2+b^2)^2 - (ab)^2.
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