Which expression is equivalent to open paren 4 plus 6 i close paren squared ?

Square the binomial: (4 + 6i)² = 4² + 2(4)(6i) + (6i)². Since i² = −1, the last term is 36i² = −36, so the result is 16 + 48i − 36 = −20 + 48i. The matching choice is negative 20 plus 48 i.

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