alleryStart learning →Planes 2x + 3y + kz = 5 and x - 2y + 4z = 1 are perpendicular when k equals
A1
B2
C-1
D4
Answer & Solution
Correct answer: A. 1
The condition 2(1) + 3(-2) + k(4) = 0 gives 4k = 4, so k = 1.
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