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Math Help - [SOLVED] Problem with this question?

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    [SOLVED] Problem with this question?

    Find the modulus and argument of z1 \times z2 where z1 is 3 - 2i and z2 is -2 + i.
    Last edited by mark1950; June 21st 2009 at 06:20 AM.
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    Quote Originally Posted by mark1950 View Post
    Find the modulus and argument of z1 \times z2 where z1 is 3 - 2i and z2 is -2 + i.
    z_1z_2 = (3-2i)(-2+i)

    Expand and simplify into the form a+bi then use Pythagoras to find the modulus and tan(x) = \frac{Im}{Re}
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