Mathematics, 16.01.2021 20:20 HistoryLee

While attempting to multiply the expression (2-5i)(5+2i) a student made a mistake. (2-5i)(5+2i)= 10+4i -25i - 10i^2
=10+4(-1)-25(-1) - 10(1)
=10-4+25-10
=21
What is the error?

Answers: 2

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While attempting to multiply the expression (2-5i)(5+2i) a student made a mistake. (2-5i)(5+2i)= 10...