Answer:
sqrt(464)
Step-by-step explanation:
|| 4v|| = || 4* (2i - 5j) ||
=|| 8i -20j||
We need to find the magnitude
|| 4v|| = sqrt( 8^2 + (-20)^2))
= sqrt(64+ 400)
= sqrt(464)
4sqrt(29)
||4v|| = 4 ||v||
4 × sqrt[2² + (-5)²]
4 × sqrt(4 + 25l
4 × sqrt(29)
Where,
sqrt: square root
