Question

What is the magnitude of -5 + 121?

Answer 1

Question:

Solution:

For a complex number z = x + yi, we define the magnitude, |z|, as follows:

$|\text{ z |=}\sqrt[]{x^2+y^2}$

thus, according to this, we can conclude that the magnitude of the given complex number is:

$|\text{ z |=}\sqrt[]{(-5)^2+(12)^2}\text{ = 13}$

so that, the correct answer is:

$13$