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Pre-Calculus-check answers

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Express 5-2i in polar form. Express your answer in radians to the nearest hundreth.
r=sqrt5^2+-2i^2 which equals sqrt21.Arctan of -2/5+pi equals -18.7

Polar form=sqrt21 cis -18.7

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  • Pre-Calculus-check answers -

    not quite
    if x+iy = r e^iT = r (cos T i sin T)
    r = sqrt (x^2+y^2)
    not sqrt [x^2 + (iy)^2]
    so r = sqrt (29), not 21

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