Question

Which complex number has an absolute value of 5?
A.–3 + 4i
B.2 + 3i
C.7 – 2i
D.9 + 4i

Answer 1

if z=a+ib then
\[\large |z|=\sqrt{a^2+b^2} \]

Answer 2

is it D ?

Answer 3

use the formula. it should take u less than a couple of minutes

Answer 4

if it were D then
\[\large |9+4i|=\sqrt{9^2+4^2}=\sqrt{81+16}=\sqrt{97}=5?\]

Answer 5

oh b

Answer 6

do the math. do u get 5?

Answer 7

use the formula. did u see what i did? we r talking about the absolute value of a complex number