If 3 is a 0 of polynomial 2x square +x+k find value of k
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p(x) =2x^2+x+k
p(3)=2×3×3+3+k=0
=2×9+3+k=0
=18+3+k=0
=21+k=0
=k=-21
p(3)=2×3×3+3+k=0
=2×9+3+k=0
=18+3+k=0
=21+k=0
=k=-21
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