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The value of c, so that for all real x, the vectors cx i, - 6 j + 3 k, x i + 2 j + 2 cx k make

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The value of c, so that for all real x, the vectors cx i, - 6 j + 3 k, x i + 2 j + 2 cx k make an obtuse angle, is 

(a) c < 0

(b) 0 < c < 4/3

(c) -(4/3) < c < 0

(d) c > 0

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1 Answer

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Best answer

Correct Option (c) -(4/3) < c < 0

Explanation:

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