Which of these expressions have a value that is a real number? Choose all that are correct. A
B
С
-2i (6 + 2i)
6i (6 – 21)
(6 + 2i) + (6 – 21)
(6 – 2i) – (6+21)
(6 – 2i) (6 – 2i)
(6 + 2i) (6 – 2i)

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