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Mathematics 16 Online
OpenStudy (lovelyharmonics):

magnitude?

OpenStudy (lovelyharmonics):

@ikram002p

OpenStudy (lovelyharmonics):

given that P=(-5,5) and Q=(-13,6) find the component form and the magnitude of |dw:1403216131663:dw|

OpenStudy (ikram002p):

|dw:1403216203511:dw|

OpenStudy (ikram002p):

u wanna for PQ ? or 2 PQ ?

OpenStudy (lovelyharmonics):

it says 2pq

OpenStudy (ikram002p):

ok :D then simply find PQ and multiply by 2

OpenStudy (ikram002p):

if u have two point P (x1,y1) ,Q (x2,y2) the component form for vector PQ is devined by <x2-x1 , y2-y1 >

OpenStudy (lovelyharmonics):

so i just multiply both of the points by 2? .-.

OpenStudy (ikram002p):

u have PQ=<x2-x1 , y2-y1 > 2PQ=2<x2-x1 , y2-y1 > 2PQ=<2(x2-x1) , 2(y2-y1 )>

OpenStudy (lovelyharmonics):

oh so its -5+13=8 and 5-6=-1 and then i multiply it by 2? 2(8,-1)=16,-2?

OpenStudy (ikram002p):

dont forget the vector end at point Q not P

OpenStudy (lovelyharmonics):

wait what .-.

OpenStudy (ikram002p):

it should be -13+5 and 6-5 for component the direction is important

OpenStudy (lovelyharmonics):

im so confused .-. is it sqrt65?

OpenStudy (ikram002p):

wait first find component PQ=<-8,1 > ok ?

OpenStudy (lovelyharmonics):

well i know its sqrt65 XD cuz only one answer has 16,-2

OpenStudy (ikram002p):

and 2PQ=<-16,2>

OpenStudy (ikram002p):

magnitude = sqrt [(16)^2 +2^2]=sqrt 260

OpenStudy (lovelyharmonics):

well then the answer has to be -16,2 instead of 16,-2

OpenStudy (ikram002p):

yes lol i told u that ealier T_T

OpenStudy (lovelyharmonics):

oh c: i never noticed that XD i sowwy

OpenStudy (ikram002p):

naaaa its ok :P

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