Lesson eLearning

Factorise x² - 9.

medium MCQ Class 9 · Mathematics · Linear Equations in Two Variables
  1. (x + 3)(x - 3)
  2. (x - 3)²
  3. (x + 3)²
  4. (x - 9)(x + 1)
Answer
(x + 3)(x - 3)

The correct answer is (x + 3)(x - 3) — x² - 3² = (x + 3)(x - 3).

Step-by-step solution

  1. Use a² - b² = (a + b)(a - b).
  2. x² - 3² = (x + 3)(x - 3).

Concept tested: Difference of Two Squares

Published · How this solution was prepared and checked

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