First slide

Algebra of complex numbers

Question

The magnitude of $\frac{3 + 4 i}{5}$

Very Easy

A

1
B

2
C

3
D

4

Solution

The magnitude of $a + b i i s \sqrt{a^{2} + b^{2}}$

Hence, the magnitude of $3 + 4 i$ is $\sqrt{9 + 16} = 5$

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