K is X + 3 is a factor of 3 X square + kx + 6
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since x+3 is it's factor therefore x=-3 will satisfy eqn
put x=-3
3(-3)^2-3k+6
27+6-3k=0
k=12
put x=-3
3(-3)^2-3k+6
27+6-3k=0
k=12
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