passiontaylor1350 passiontaylor1350

11-02-2021
Mathematics

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Explain why 21i^2 is equivalent to -21

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GeorgePP GeorgePP

11-02-2021

Answer:

Step-by-step explanation:

The imaginary number 'i' is equal to the square root of -1. If you were to square the square root, they both cancel and you get -1.

[tex]21i^2=21(\sqrt{-1} )^2=21(-1)=-21[/tex]

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