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April 16, 2014

April 16, 2014

Posted by **hanaya** on Monday, June 10, 2013 at 3:36pm.

- Calculus Grade 12 -
**Steve**, Monday, June 10, 2013 at 4:13pm(B-A)x(C-A) = {-4,3,-6}x{-3,2,-11} = {-21,-26,1}

If D is in the plane of ABC, then (D-A)x(C-A) will also be normal to the plane of ABC. That is,

{-3,k+2,-8}x{-3,2,-11} = {-21,-26,1}

The plane is

21x+26y-z = 26

So,

21+26k+2 = 26

26k = 3

k = 3/26

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