Algebrahard · Past Paper
Factorize: 1 - a^2 - b^2 - 2ab
A(1+a+b)(1-a-b)
B(1-a+b)(1+a-b)
C(1-a-b)^2
D(a+b+1)(a+b-1)
✓ Correct Answer: A — (1+a+b)(1-a-b)
1 - (a^2+2ab+b^2) = 1^2 - (a+b)^2 = (1+a+b)(1-a-b).
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✓ Correct Answer: A — (1+a+b)(1-a-b)
1 - (a^2+2ab+b^2) = 1^2 - (a+b)^2 = (1+a+b)(1-a-b).
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