I need help with this please

This expression does not factor.

The factors of 40 are 1 and 40, 2 and 20, 4 and 10, and 5 and 8.

Since the last term is -40, one of the factors must be positive and one must be negative.

|40-1| = 39

|20-2| = 18

|10-4| = 6

|5-8| = 3

Since none of those = -1, the express is "prime" and can't be factored.