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Mathematics 18 Online
OpenStudy (anonymous):

Find the vector from the point (4,1,8) to the point (2,2,0)

OpenStudy (amistre64):

zero one out and do the same to the other

OpenStudy (amistre64):

(4, 1,8) (2,2,0) -4-1-8 -4-1-8 ---------------- 0,0,0 <-2,2,-8>

OpenStudy (amistre64):

and simplify :)

jimthompson5910 (jim_thompson5910):

@amistre64 think you meant <-2, 1, -8>

OpenStudy (amistre64):

.... im having issues with my fingertips today, i say one thing and they type another ... :)

OpenStudy (amistre64):

but yes ...

OpenStudy (ybarrap):

(2 - 4) i + (2 - 1) j + (0 - 8)k, where i,j,k are unit vectors = -2i + j -8 k which is the same as (-2,1,-8) Ans. (-2,1,-8)

OpenStudy (anonymous):

hmm....says their wrong?

jimthompson5910 (jim_thompson5910):

if in doubt, negate everything lol

OpenStudy (amistre64):

they prolly dont want a negtive first

jimthompson5910 (jim_thompson5910):

chances are the vector is going in the wrong direction

OpenStudy (amistre64):

<2,-1,8> and check to see that it doesnt ask for the unit vector

OpenStudy (anonymous):

yea...still poppin up wrong

OpenStudy (amistre64):

then it asked you something else

jimthompson5910 (jim_thompson5910):

then they probably want the unit vector pointing in one of those two directions?

OpenStudy (zarkon):

for the question you asked the answer is, as jim pointed out, <-2, 1, -8>

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