Question

Let u
(5, -12) and C =
3. What is cu?
39
39
51
21
Done -

Answer 1

Answer: $||cu||=39$

Step-by-step explanation:

Given

$u=<5,-12>$ and $c=-3$

$cu$ is a vector with 3 times the vector u in opposite direction

$|u|=\sqrt{5^2+(-12)^2}\\|u|=\sqrt{25+144}\\|u|=13$

$\therefore ||cu||=|3\times 13|\\\Rightarrow ||cu||=39$

option (a) is correct.