Factor the quadratic polynomial

MATHEMATICS · Single correct · AoPS · Mathematics · Quadratic Equations - Part 1 · Quadratic Equations - Part 1

Problem

Factor the quadratic polynomial x2−x−20x^2 - x - 20. Which of the following is its correct factorisation? (a) (x+4)(x+5)(x + 4)(x + 5) (b) (x−10)(x+2)(x - 10)(x + 2) (c) (x+4)(x−5)(x + 4)(x - 5) (d) (x−4)(x+5)(x - 4)(x + 5)

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