Which statement is an identity (true for every x)?

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

C) (x + 3)^2 = x^2 + 6x + 9

Only (x + 3)^2 = x^2 + 6x + 9 holds for all x. SLO M-09-B-15 · Knowledge

Mathematics MCQ · More Logic MCQs · Practise