Question
The factors of $x^2 - 9$ is:
✓
Answer
$x^2 - 9$
$= x^2 - 3^2$
Using identity $a^2 - b^2 =(a + b) (a - b)$
$= (x + 3) (x - 3)$
$= x^2 - 3^2$
Using identity $a^2 - b^2 =(a + b) (a - b)$
$= (x + 3) (x - 3)$
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