Given z=−1+2iz = -1 + 2i, compute the magnitude ∣z∣|z|.

Introduction to Complex Numbers

9. Roots, Radicals, and Complex Numbers / Introduction to Complex Numbers / Problem 2

Problem 2

Given $z = - 1 + 2 i$ , compute the magnitude $∣ z ∣$ .

$3$

$5$

$the square root of 5$

$the square root of 3$