Question
In Exercises 15-32, represent the complex number graphically, and find the trigonometric form of the number.$-5i$
Step 1
The magnitude (r) of a complex number in the form $a+bi$ is given by $\sqrt{a^2+b^2}$. In this case, the complex number is $-5i$, which can be rewritten as $0-5i$. So, $a=0$ and $b=-5$. Therefore, $r=\sqrt{0^2+(-5)^2}=\sqrt{25}=5$. Show more…
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