Question
Factorise the following using the identity $a^2- b^2= (a + b)(a - b)$.
$ x^2- 9$
$ x^2- 9$
✓
Answer
$ x^2- 9$
$x^2- 3^2= (x - 3)(x + 3)$
$x^2- 3^2= (x - 3)(x + 3)$
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