Find the modulus and argument of $\displaystyle z1 \times z2$ where z1 is 3 - 2i and z2 is -2 + i.
Last edited by mark1950; Jun 21st 2009 at 05:20 AM.
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Originally Posted by mark1950 Find the modulus and argument of $\displaystyle z1 \times z2$ where z1 is 3 - 2i and z2 is -2 + i. $\displaystyle z_1z_2 = (3-2i)(-2+i)$ Expand and simplify into the form $\displaystyle a+bi$ then use Pythagoras to find the modulus and $\displaystyle tan(x) = \frac{Im}{Re}$
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