How do you find abs( 7+9i )?

1 Answer
sente
May 6, 2016

|7+9i| = sqrt(130)

Explanation:

Given a complex number a+bi, the modulus of that number, denoted |a+bi|, is the distance from that number to the origin on the complex plane. Then, we have

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

In this case, that gives us

|7+9i| = sqrt(7^2+9^2) = sqrt(130)

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