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Math Help - modulus and argument

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    modulus and argument

    find the modulus and argument of

    (a)6+j
    (b)-5-9j


    do i sub into
    \sqrt{a^2+b^2}

    and
    tan^{-1}\frac{a}{b}

    many thanks
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  2. #2
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    Quote Originally Posted by decoy808 View Post
    find the modulus and argument of

    (a)6+j
    (b)-5-9j


    do i sub into
    \sqrt{a^2+b^2}

    and
    tan^{-1}\frac{a}{b}

    many thanks
    For z = a + jb where j^2 = -1

    You have your trig ratio wrong, the imaginary axis implies the opposite and the real axis the adjacent

    therefore \arg (z) =\arctan \left(\frac{b}{a}\right)

    Otherwise good
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