anonymous
  • anonymous
r(t)=(1-t)<-2,-1>+t<1,2> the answer is < -2+3t,-1+3t> but i can't understand how can we do this calculation
Mathematics
jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
multiply ?
anonymous
  • anonymous
(-2(1-t), -1(1-t)) +(t, 2t)
anonymous
  • anonymous
no

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anonymous
  • anonymous
ordered pairs.. what i guessed
anonymous
  • anonymous
=(-2+2t+t,-1+t+2t) =(-2+3t, -1+3t)
amistre64
  • amistre64
i cant make out what the quaestion is asking for lol
amistre64
  • amistre64
maybe its the addition of 2 vectors from initial points? or the distance between then or something....
amistre64
  • amistre64
scalars and addition....ok got it
anonymous
  • anonymous
it is in line integral notes
amistre64
  • amistre64
it is vector notation. the () are equations to calculate the scalar functions of each vector; hence(1-t) and (t) cahnge the size of the arrow that represents each vector..
amistre64
  • amistre64
6<2,3> is an arrow from the origin to a point (2,3); the scalar says to multiply those values by 6 in this case... <6(2),6(3)> = <12,18>which is an arrow from the origin to a point (12,18)
amistre64
  • amistre64
(1-t)<-2,-1> means to scale the vector by whats in the (): <-2(1-t),-1(1-t)> = <-2+t,-1+t>
amistre64
  • amistre64
vector t<1,2> is scaled to : <1t,2t>.... now add the vectors together
amistre64
  • amistre64
<-2+t, -1+t> < 1t , 2t > ------------- <-2t+2t, -1+3t>
amistre64
  • amistre64
gotta read thru the typos lol
anonymous
  • anonymous
now u really need some vitamin :P
anonymous
  • anonymous
-2(1-t) why that's answer isn't -2+2t :S you write -2+t
anonymous
  • anonymous
oh yes... i mistake, u r right
amistre64
  • amistre64
you gotta read it for what it is; not for the typos in it lol
amistre64
  • amistre64
if i type 2+6=9....you gotta have sense enough to understand that im an idiot and look past the fat fingers to the message itself lol
anonymous
  • anonymous
how sweet ..... suppose u r a teacher, n marking the scripts, underlining the mistakes, n get the same reply from the student ;)
anonymous
  • anonymous
just kidding :P
anonymous
  • anonymous
here most of the things must be understood :)
amistre64
  • amistre64
lol
anonymous
  • anonymous
i think my question can't replied but thanks
anonymous
  • anonymous
oh no... u may ask where r u confused
anonymous
  • anonymous
just go on :)
amistre64
  • amistre64
If you know about vectors and scalars of vectors and addition of vectors; then the question is answered...
amistre64
  • amistre64
n + m + ----------
anonymous
  • anonymous
thanks:D

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