Factorise completely.

MATHEMATICS · Single correct · AoPS · Mathematics · Special Factorizations · Special Factorizations

Problem

Factorise x4−81x^{4}-81 completely. (a) (x2−9)(x2+9)(x^{2}-9)(x^{2}+9) (b) (x−3)2(x+3)2(x-3)^2(x+3)^2 (c) (x−3)(x+3)(x2+9)(x-3)(x+3)(x^{2}+9) (d) (x−9)(x+9)(x-9)(x+9)

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