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16 February, 11:05

Which choice is equivalent to the expression below?

Ì - 20

A. - 20i

B. 2i Ì5

C. - 2 Ì5

D. 2 Ì5i

E. 20i

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Answers (1)
  1. 16 February, 11:37
    0
    It seems you tried to write √ (-20)

    use the fact tha - 1 = i^2

    Then, √ (-20) = √ (20i^2) = (√20) i = (√ (5*4)) i = 2√5 i = 2i√5, which seems to be what you tried to write in the option B.
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