If a = (4, 3, 9), b = (2, 8, 5) and c = (0, 7, 1) Calculate the magnitude of 2a - 5b + 3c

2a - 5b + 3c =
2(4, 3, 9)-
5(2, 8, 5)+
3(0, 7, 1) =
(8,6,18)-
(10,40,25)+
(0,21,3) =
(8-10+0,6-40+21,18-25+3)=
(-2,-13,-4)
magnitude :

:)