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finding the arg(z) of the complex number z watch

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    Z1= -3+3i

    r= sq rt. of 18

    Arg(z) = tan theta = 3/(-3) = -1
    theta = -1/4 pi

    pi - 1/4 pi = 3/4pi

    Arg(z) = 3/4pi

    Is this the correct answer?
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    (Original post by bio_ray18)
    Z1= -3+3i

    r= sq rt. of 18

    Arg(z) = tan theta = 3/(-3) = -1
    theta = -1/4 pi

    pi - 1/4 pi = 3/4pi

    Arg(z) = 3/4pi

    Is this the correct answer?
    Yes, the answer is correct.
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    if in doubt draw a quick sketch of the argand diagram (x-axis=real; y-axis=imaginary)

    and that way you can confirm if your calculated angle (argument) is sensible
 
 
 
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Updated: May 19, 2010

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