Factorise completely over the real numbers.

MATHEMATICS · Single correct · AoPS · Mathematics · Follow the Rules · Follow the Rules

Problem

Factorise x4−5x2+4x^4 - 5x^2 + 4 completely over the real numbers. (a) (x2−1)(x2−4)(x^2-1)(x^2-4) (b) (x−1)(x+1)(x−2)(x+2)(x-1)(x+1)(x-2)(x+2) (c) (x2+1)(x2−4)(x^2+1)(x^2-4) (d) (x2−2)2(x^2-2)^2

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