Answer:
b
Explanation:
assuming you meant
(6 + 2i)(6 - 2i)
note that i² = - 1
each term in the second factor is multipied by each term in the first factor, that is
6(6 - 2i) + 2i(6 - 2i) ← distribute parenthesis
= 36 - 12i + 12i - 4i² ← collect like terms
= 36 - 4(- 1)
= 36 + 4
= 40