Question

How do you multiply `(4m-3n)(4m+3n)`?

Answer 1

`(4m-3n)(4m+3n) = 16m^2-9n^2`

Explanation:

The general difference of squares can be written as
`color(white)("XXXX")` `(a-b)(a+b) = a^2-b^2`

Substituting `(4m)` for `(a)`
and `(3n)` for `(b)`
in the general form, gives the answer as stated above.