Question

Multiply and simplify:
(1 - 5i)(1 -2i)

Answer 1

-9-7i

Explanation:

1) Use the FOIL Method : (a+b)(c+d)=ac+ad+bc+bd

1-2i-5i-10

2) Collect Like Terms

(1-10)+(-2i-5i)

3) Simplify

-9-7i