Three Dimensional Geometry Question 366
Question: If the planes $ 3x-2y+2z+17=0 $ and $ 4x+3y-kz=25 $ are mutually perpendicular , then $ k= $
[MP PET 1995]
Options:
A) 3
B) ? 3
C) 9
D) ? 6
Show Answer
Answer:
Correct Answer: A
Solution:
Obviously, $ 3\times 4+(-2)\times 3+2\times (-k)=0 $
$ \Rightarrow 12-6-2k=,0\Rightarrow k=3., $
BETA
