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PrinceBrainly
Hello there.

 5i x i x -2i

5i^2x^2−2i
SuperLegend
5i x i x -2i
Multiply 5i by i
5i^2 x -2i
Multiply the 5 by -2 while multiplying the i^2 by i.
Final Answer: -10i^3 (Negative ten i to the third power.)