How do you find the magnitude <-4,1>? Precalculus Vectors in the Plane Vector Operations 1 Answer Somebody N. Oct 21, 2017 #sqrt(17)# Explanation: The magnitude of a vector #((a),(b))# is: #sqrt(a^2+b^2)# #sqrt((-4)^2+(1)^2)=sqrt(17)# Answer link Related questions Question #b4ef9 What is meant by a component of a vector? How do I find the vertical component of a vector? How do i find the horizontal component of a vector? Is vector addition commutative? What happens when I multiply a vector by itself? What is the definition of vector addition? How do I do vector subtraction? What is a velocity vector? How can the law of cosines be used to find the magnitude of a resultant? See all questions in Vector Operations Impact of this question 2703 views around the world You can reuse this answer Creative Commons License