Question

Factor this expression completely and then place the factors in the proper location on the grid. Note: Place factors alphabetically in the grid! mn - 4m - 5n + 20

Answer 1

mn - 4m - 5n + 20

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

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

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

(m - 5)(n - 4)

So mn - 4m - 5n + 20 completely factors to (m - 5)(n - 4)