To factorise x^2+9x+20 we need two numbers whose sum is 9 and product is 20. They are:

  1. 1 and 20
  2. -4 and -5
  3. 4 and 5
  4. 3 and 6
Answer

C) 4 and 5

4 + 5 = 9 and 4 5 = 20, so x^2+9x+20 = (x+4)(x+5). SLO M-09-A-17 · Knowledge

Mathematics MCQ · More Factorization MCQs · Practise