The planes 5x + y + 3z + 1 = 0 and x + y – kz + 6 = 0 are orthogonal, find k.

(a) 4

(b) 2

(c) 6

(d) 8

The question was posed to me in exam.

My question is taken from Three Dimensional Geometry in portion Three Dimensional Geometry of Mathematics – Class 12

NCERT Solutions for Subject Clas 12 Math Select the correct answer from above options

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