• 2021 December(E23) Math Question 53

    Number Types & Properties

    - Complex Number

    Complex Number
    Choice E

    Given that

    ι2={−1}\iota^2=\sqrt\{-1\}

    then

    (3+bι)(3−bι)=9−b2ι2(3+b\iota)(3-b\iota)=9-b^2\iota^2
    =9+b2=9+b^2

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