Question

Perform the operation and write the result in the standard form.
(1 + 9i)(1 - 9i)​

Answer 1

82+0i

Step-by-step explanation:
(1+9i)(1-9i)
=(1-9i+9i-81i^2)
(Remember i^2 is -1)
=(1+81)
=82
In standard form, its written as 82+0i

Answer 2

10-18i

Step-by-step explanation:

1(1-9i)+9(1-9i)

1-9i+9-9i

1+9-9i-9i

10-18i