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When subtracted, what is the simplified form of (56 21 i ) (31 + 15 i )? Write the answer in standard form, a +

When subtracted, what is the simplified form of (56 21i) (31 + 15i)? Write the answer in standard form, a + bi, where a and b are real numbers.

87 6i

25 36i

25 6i²

25 + 36i

Which answer is correct?

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