Factorise $x^{2} - 9$.

Factorise $x^{2} - 9$.
  1. $(x-3)(x+3)$
  2. $(x-9)(x+9)$
  3. $(x-3)^{2}$
  4. $(x+3)^{2}$

Solution

$a^{2} - b^{2} = (a-b)(a+b)$.

Asked in: MH-SSC-9

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