CAPE Pure Mathematics Unit 1 · May/June 2014 · Paper 1 · Question Q12
a^4 - b^4 =
- (A)
(a - b)(a^3 - a^2b + ab^2 - b^3) - (B)
(a + b)(a^3 + a^2b - ab^2 - b^3) - (C)
(a - b)(a^3 + a^2b - ab^2 - b^3) - (D)
(a + b)(a^3 - a^2b + ab^2 - b^3)
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