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Complex Numbers

Find the modu...

Question

Find the modulus and principal argument of -4.

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Solution

Let $z = - 4 + 0 i$ . Then, $| z | = \sqrt{(- 4)^{2} + 0} = 4$
The point (-4,0) representing $z = - 4 + 0 i$ lies on the negative side of real axis. Therefore, principal argument of z is $π$ .

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