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complex number maths question?

Let A=(1-3i)(2+i)

(1)- express A in the form of p+qi

(2)- for what value of a is Ā / 2i = a w

help me understand how to solve this one, show every step from no.2

thanks very much

Update:

w is just a letter..

thx!! ^^

1 Answer

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  • 10 years ago
    Favorite Answer

    (1) Just multiply:

    A = 2 + i - 6i +3 (in the last term used i.i = -1)

    A = 5 - 5i

    (2) The conjugate of A is ; Ā = 5 + 5I and than:

    (5 + 5i)/2i =

    (multiply by i

    (5 + 5i).i/-2 =

    (5i - 5)/-2 =

    5/2 - (5/2).i

    Mathematics is no sorcery: I don't have any idea what "a w" means.

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