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For what value of k , is 3 a zero fo the...

For what value of `k ,` is 3 a zero fo the polynomial `2x^2+x+k`?

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Given,
`3` is a zero of the polynomial `2x^2+x+k`.
`2(3)^2+3+k = 0`
`18 + 3 + k = 0`
`k = -21`
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