Question

please tell me the answer,​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

k=3

Step-by-step explanation:

Let, f(x) =2x²+kx+1

x+1=0

or, x=-1

f(-1)=2(-1)²-k+1

= 2-k+1

=3-k

3- k=0

k=3