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Question
If 3 is a zero of the polynomial 2x2 + x + k, find the value of k.
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Solution
Given: x = 3 is one zero of the polynomial 2x2 + x + k
Therefore, it will satisfy the above polynomial.
Now, we have
2(3)2 + 3 + k = 0
⇒ 21 + k = 0
⇒ k = –21
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