How do you find $abs(2+4i )$ ?

Apr 8, 2016

$2sqrt5$

Given a complex number z = x + yi then the modulus of z is.

$|z| = | x+yi| = sqrt( x^2 + y^2)$

$rArr |2+4i| = sqrt(2^2+4^2) = sqrt20 = 2sqrt5$

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How do you find abs(2+4i )abs(2+4i )?