Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) If the points A, B, C and D with position vectors `hati+hatj+hatk,2hati+3hatj+hatk,hati+2hatj+5hatk` and `lambdahati+3hatj+4hatk` are coplanar then `lambda` is equal to - Sarthaks eConnect

If the points A, B, C and D with position vectors `hati+hatj+hatk,2hati+3hatj+hatk,hati+2hatj+5hatk` and `lambdahati+3hatj+4hatk` are coplanar then `lambda` is equal to:

If the points A, B, C and D with position vectors `hati+hatj+hatk,2hati+3hatj+hatk,hati+2hatj+5hatk` and `lambdahati+3hatj+4hatk` are coplanar then `lambda` is equal to:

A.

5

B.

7

C.

2

D.

none of these

Solution

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Best answer

If vectors `bar(AB), bar(AC)` and `bar(AD)` are coplaner, then the points A,B,C and D are coplaner.

`=> 8lambda=13=>lambda=13/8`