Factorise (x + 1)(x + 2)(x + 3)(x + 4) - 3.

  1. (x^2 + 5x + 3)(x^2 + 5x + 7)
  2. (x^2 + 5x + 4)(x^2 + 5x + 6)
  3. (x^2 + 5x + 1)(x^2 + 5x + 9)
  4. (x + 3)^2(x + 7)^2
Answer

A) (x^2 + 5x + 3)(x^2 + 5x + 7)

Pair (x + 1)(x + 4) = y + 4 and (x + 2)(x + 3) = y + 6 with y = x^2 + 5x: (y + 4)(y + 6) - 3 = y^2 + 10y + 21 = (y + 3)(y + 7). SLO M-09-A-18 · Understanding

Mathematics MCQ · More Factorization MCQs · Practise