gaby102005 gaby102005

29-01-2020
Mathematics

contestada

Simplify the expression (9 + 2i)(9 − 2i).

81 − 18i
81 + 18i
77
85

Respuesta :

alivetilldeath alivetilldeath

29-01-2020

Answer:

=85

Step-by-step explanation:

I'm pretty sure I'm correct

Answer Link

cupcakepony768 cupcakepony768

18-05-2022

Answer:

85

Step-by-step explanation:

Apply complex arithmetic rule: (a + bi) (a - bi) = a^2 + b^2 A = 9 B = 2

= 9^2 + 2^2

= 81 + 4

= 85

Therefore, the answer is 85

Answer Link

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