Question

How do you factor the expression `18x²-2`?

Answer 1

`2(3x - 1)(3x+1)`

Explanation:

First take out the common factor, giving `2(9x^2 - 1)`
Then recognize this as the difference of two squares and use the fact that `(m^2 - n^2)` factors as`(m-n)(m+n)` to get
`2(3x - 1)(3x+1)`