Factorise completely over real numbers:

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

Factorise completely over real numbers: 2x3+7x2−7x−302x^{3}+7x^{2}-7x-30. Which of the following is the correct factorisation? (a) (x+2)(2x+5)(x−3)(x+2)(2x+5)(x-3) (b) (x−2)(2x+3)(x+5)(x-2)(2x+3)(x+5) (c) (x−2)(2x+5)(x+3)(x-2)(2x+5)(x+3) (d) (x−2)(2x−5)(x+3)(x-2)(2x-5)(x+3)

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