2.k^2/4 -(k-6)k/2-3k=0k^2/2 - k^2/2+3k-3k=0 so all VALUES cancels out ....on DIFFERENTIATING ,we GET...4x+k-6=0so, 4(-k/2)+k-6=0-2k+k-6=0-k-6=0-k =6k= -6....I hope this is the ANSWER....
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