Question

if 3 is a zero of the polynomial 2x^2+x+k, find the value of k

Answer 1

Let

f(x) =2x^2+x+k.

Given: 3 is a zero of f(x).

Therefore,

f(3)=0

2*3^2+3+k=0

2*9+3+k=0

18+3+k=0

21+k=0

K= - 21

Hence the value of k is - 21.

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Answer 2

here is your correct answer