Question

Multiply (4 + i)(1 − 5i).

9 − 19i
−1 − 19i
4 − 5i2
4 − 19i − 5i2

Answer 1

OTHER PERSON IS CORRECT ITS 9 - 19i

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Answer 2

(4 + i)(1 - 5i)

First, expand to get rid of parentheses.

`4 - 20i + i + 5`
Second, gather the like terms which contain the same variables.

`(4+5) + (-20i + i)`
Third, add 4 + 5.

`9 + (-20i + i)`
Fourth, subtract -20i + i.

`9 - 19i`

Answer: 9 - 19i