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If 3 is a zero of the polynomial 2x2 + x + k, find the value of k.

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2 Answers

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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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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