Question

How do you find the product of `(n-3)(n+3)`?

Answer 1

`color(blue)(n^2-9`

Explanation:

`(n-3)(n+3)`
`color(white)(......................)n-3`
`color(white)(.................) xx n+3`
`color(white)(......................)overline(n^2-3n)`
`color(white)(.........................)+3n-9`
`color(white)(......................)overlinecolor(blue)((n^2" "-9)`