Question 1 of 20
Time: 00:00
If $z=x+iy$ then |z|=
Difficulty: Hard
A:
$\sqrt{x^{2}+y^{2}}$
B:
$\sqrt{x^{2}-y^{2}}$
C:
$x^{2}+y^{2}$
D:
$x^{2}-y^{2}$
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$\sqrt{x^{2}+y^{2}}$
$\sqrt{x^{2}-y^{2}}$
$x^{2}+y^{2}$
$x^{2}-y^{2}$