CBSE Class 12 Math 2020 Outside Delhi Set 1 Solved Paper

Question : 7

Total: 36

The two planes x−2y+4z=10 and 18x+17y+kz=50 are perpendicular, if k is equal to

Solution: 👈: Video Solution

P1:x−2y+4z−10=0
P2:18x+17y+kz−50=0
P1 and P2 are perpendicular if
‌18−34+4k‌=0
⇒‌4k‌=16
⇒k‌=4

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