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91Ó°ÊÓ

The vector v is represented by the directed line segment →PQWrite v in the form ai + bj and find ∥v∥.

role="math" localid="1646907960914" P=(-1,2);Q=(3,-6)

Short Answer

Expert verified

v=2i-4j∥v∥=25

Step by step solution

01

Step 1. Given information

We have to write the vector v in the form ai+bjand also we have to find ∥v∥.

Given points are:

P=(-1,2);Q=(3,-6)

02

Step 2. Find the position of vector

To find the position of the vector,

we know that,

v=P1P2→

where,

P=(x,y)

it can be written as:

v=x2−x1,y2−y1

03

Step 3. Find the vector v

For the points we have,

v=[P,Q]=[(3−1),(−6−(−2))]=(2,−4)=2i−4j

04

Step 4. Calculate the magnitude

∥v∥=(2)2+(−4)2=4+16=20=25

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