if 3x+1 is factor of 12x^3-2x^2+kx+1 find k
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since X=-⅓
then 4/9-2/9+k/3+1=4-2+3k+9÷9
=2+3k+9÷9=0
=11+3k÷9=0
=11+3k=0
=k=-11/3
then 4/9-2/9+k/3+1=4-2+3k+9÷9
=2+3k+9÷9=0
=11+3k÷9=0
=11+3k=0
=k=-11/3
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