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# Complex numbers question watch

1. If z = 2 – 5 j then what does( j z)*= ?

ive got the written solution being:

z= 2 – 5 j
j z= 5 + 2 j
( j z)*= 5 – 2 j

I don't understand how the second part was worked out (jz).

How did they get from z = 2-5j to jz=5+2j??

thanks.
2. jz = j(2 - 5j) = 2j - 5j^2

and j^2 = -1.

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Updated: March 21, 2009
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