A) \[\sqrt{21},(1,\,2,\,8)\]
B) \[3\sqrt{21},(3,\,2,\,8)\]
C) \[21\sqrt{3},(1,\,2,\,8)\]
D) \[3\sqrt{21},(1,\,2,\,8)\]
Correct Answer: D
Solution :
Let M be the foot of perpendicular from (7, 14, 5) to the given plane, then PM is normal to the plane. So, its d.r.'s are 2, 4, ?1. Since PM passes through \[P(7,14,5)\] and has d.r.'s 2, 4, ?1. Therefore, its equation is \[\frac{x-7}{2}=\frac{y-14}{4}=\frac{z-5}{-1}=r\],You need to login to perform this action.
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