A) -2
B) -1
C) 1
D) 2
Correct Answer: B
Solution :
[b] Suppose P divides QR in ratio \[\lambda :1\]. Then, co-ordinates of P are \[\left( \frac{5\lambda +2}{\lambda +1},\frac{\lambda +2}{\lambda +1},\frac{-2\lambda +1}{\lambda +1} \right)\]. It is given that the x-coordinate of P is 4. i.e., \[\frac{5\lambda +2}{\lambda +1}=4\Rightarrow \lambda =2\] So, z-coordinate of P is \[\frac{-2\lambda +1}{\lambda +1}=\frac{-4+1}{2+1}=-1\].You need to login to perform this action.
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