Asked by Sally

The expression (3-7i)^2 is equivilant to? i know what the answer is im just not sure how to get it please help
Answered by Reiny
Just expand it
(3-7i)^2
= (3-7i)(3-7i)
= 9 - 42i + 49i^2 , but i^2 = -1
= 9 - 42i - 49
= -40 - 42i
Answered by Sally
okay thank you
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