Vectors problem

Apr 2010
60
0
Point C has position vec (2 , 3) and point D has position vec (1 , 2)
find position vec of the point which divides CD in the ratio 4:-3
I really don't understand the ratio part of this question.
I know that minus sign indicates that it divides externally
so i took the point as P which divides externally

Than i soldes
OP>=OC> + CP>
i know that CP> is 3/4th of CD>
so 2i + 3j + 3/4(-i-2j + 2i +3j)
Solving this i get the wrong answer.
Can someone explain?A diagram would be much appreciated.
 

Grandad

MHF Hall of Honor
Dec 2008
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South Coast of England
Hello kandyfloss
Point C has position vec (2 , 3) and point D has position vec (1 , 2)
find position vec of the point which divides CD in the ratio 4:-3
I really don't understand the ratio part of this question.
I know that minus sign indicates that it divides externally
so i took the point as P which divides externally

Than i soldes
OP>=OC> + CP>
i know that CP> is 3/4th of CD>
so 2i + 3j + 3/4(-i-2j + 2i +3j)
Solving this i get the wrong answer.
Can someone explain?A diagram would be much appreciated.
This is the same question that you asked here, to which I gave an answer that you said made things clear. What is the problem now?

Grandad
 
Apr 2010
60
0
My sincere apologies..i tried looking for that thread but couldnt find. It thank u :)
 
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