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The Brainliest Answer!
2016-04-22T19:40:18+05:30
The polynomial is :

2x² + x + k

Suppose, 3 is zero of polynomial for some value of k, then

2x² + x + k = 0

∴2(3)² + 3 + k = 0           (Putting x = 3)
∴2*9 + 3 + k = 0
∴18 + 3 + k = 0
∴21 + k = 0
k = -21

Thus, for k = -21, 3 is a zero of the polynomial.


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