Question

Factor this expression:

mn - 4m - 5n + 20

Answer 1

(m-5) (n-4)

Explanation:

mn - 4m - 5n + 20

We will factor by grouping

mn -5n -4m +20

Factor an n out of the first 2 terms and a -4 out of the last 2 terms

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

Now factor out a m-5

(m-5) (n-4)