If z is a complex number $z = 9 - 12 i$ find $| z |$

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Solution

The correct option is C 15
$z = 9 - 12 i | z | = \sqrt{x^{2} + y^{2}} = \sqrt{9^{2} + 12^{2}} \sqrt{81 + 144} = \sqrt{225} = 15$

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