For this case, we have to define the difference of squares:
[tex]a ^ 2-b ^ 2 = (a + b) (a-b)[/tex]
We then have the following expression:
[tex]x ^ 2 - 9[/tex]
From here, we observe that:
[tex]a = x\\b = 3[/tex]
Therefore, replacing values we have:
[tex]x ^ 2 - 9 = (x + 3) (x-3)[/tex]
Answer:
The factorization of the given expression is:
[tex]x ^ 2 - 9 = (x + 3) (x-3)[/tex]
