Multiply (4 + i)(1 − 5i).
9 − 19i
−1 − 19i
4 − 5i2
4 − 19i − 5i2

(4 + i)(1 - 5i)

First, expand to get rid of parentheses.

Second, gather the like terms which contain the same variables. 

Third, add 4 + 5.

Fourth, subtract -20i + i.


 9 - 19i