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pavadrin
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Points A, B and C lie on the line r = 2i + 3j + λ(i + 4j) and have position vectors given by λ=-1, λ=1 and λ=2 respectively.
Find a) AB
b) AB:BC
The answer for part a is the square root of 17 (in exact form) however I keep getting the suare root of 20.
Here is what I am doing:
OB = 3i – j and OC = 5i – 5j
BC= BO + OC
BC= -(3i – j) + (5i – 5j)
BC= 2i – 4j
Therefore the magnitude of BC = square root of 20
As for part b, I’m not sure what it’s asking me to do
Thanks
Pavadrin
Find a) AB
b) AB:BC
The answer for part a is the square root of 17 (in exact form) however I keep getting the suare root of 20.
Here is what I am doing:
OB = 3i – j and OC = 5i – 5j
BC= BO + OC
BC= -(3i – j) + (5i – 5j)
BC= 2i – 4j
Therefore the magnitude of BC = square root of 20
As for part b, I’m not sure what it’s asking me to do
Thanks
Pavadrin
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