Question

Factor this expression completely and then place the factors in the proper location. Note: Place factors alphabetically!

mn - 4m - 5n + 20

Answer 1

To solve this problem you must apply the proccedure shown below:

1. You have the following expression given in the problem above:

`mn - 4m - 5n + 20`

2. The first thing you must do to factor the expression is to group the terms, as following:

`(mn-4m)+(-5n+20)`

3. Now, choose the greatest common factor of each group:

`m(n-4)-5(n-4)`

4. Now, you need to factor the expression by factoring out the
`n-4`

`(m-5)(n-4)`

The answer is:
`(m-5)(n-4)`