Which expression is equivalent to open paren 3 plus 5 i close paren squared ?

Square the binomial: (3 + 5i)² = 3² + 2(3)(5i) + (5i)². Since i² = −1, this becomes 9 + 30i − 25 = −16 + 30i. The equivalent expression is negative 16 plus 30i, choice B.

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