How do you find $abs( -7i )$ ?

Jan 9, 2018

$|-7i | = 7$

Using the definition:

$|a+bi|=sqrt(a^2+b^2)$

Then:

$|-7i | = sqrt ( 0^2+(-7)^2)$
$\ \ \ \ \ \ \ \ \ \ = sqrt ( 49)$
$\ \ \ \ \ \ \ \ \ \ = 7$

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How do you find abs( -7i )abs( -7i )?