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Math Help - Polar form of rectangular coordinates

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    Polar form of rectangular coordinates

    How do write z=-5+2i in polar form?
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    Re: Polar form of rectangular coordinates

    Quote Originally Posted by derek1008 View Post
    How do write z=-5+2i in polar form?
    The principle value of the argument of a complex number z=a+bi not on any axis is found by the following.
    Arg(z) = \left\{ {\begin{array}{rl}   {\arctan \left( {\frac{b}{a}} \right),} & {a > 0}  \\   {\arctan \left( {\frac{b}{a}} \right) + \pi ,} & {a < 0\;\& \,b > 0}  \\   {\arctan \left( {\frac{b}{a}} \right) - \pi ,} & {a < 0\;\& \,b < \pi }  \\ \end{array} } \right.

    So Arg(-5+2i)=~? and |-5+2i|=~?
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