Evaluate |-3i|

Math
|-3i|
Use the formula |a+bi|=a2+b2 to find the magnitude.
02+(-3)2
Raising 0 to any positive power yields 0.
0+(-3)2
Raise -3 to the power of 2.
0+9
Add 0 and 9.
9
Rewrite 9 as 32.
32
Pull terms out from under the radical, assuming positive real numbers.
3
Evaluate |-3i|

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