Factor the following polynomial x^2-9

(x+3)(x-3)

Step-by-step explanation:

We know that

So, here we have x² and 9, which can be written as 3².

Therefore, we can have x=a and 3=b

So we get

(x+3)(x-3)

To check that we are correct, we can expand the brackets:

x²-3x+3x-9

=x²-9

You just distribute 9 inside the parentheses.

9(a - 3b)

9a - 27b

Hope this helps!