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i*i= -1 right?

 Jul 25, 2017
 #1
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Sqrt(-1) = i

i^2 =sqrt(-1) x sqrt(-1) = - 1 (you got it right)

i^3 = -1 x i = -i

i^4 =-1 x -1 = 1 Then the pattern repeats.

 Jul 25, 2017
 #2
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Yup correct.

 Jul 25, 2017
 #3
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1=i

i×i=1×1=12=1

yes.

 Jul 26, 2017

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