Question

How do you factor completely `2x^2-18`?

Answer 1

`2(x+3)(x-3)`

Explanation:

To factor `2x^2-18`

Begin by factoring out the 2 from each term

`2(x^2-9)`

Now we recognize that `x^2-9` is the difference of two squares
`x*x` and `3*3`

This factors to

`2(x+3)(x-3)`