Question

If 3 is a zero of the poly.2x^2+x+k,find the value of k.​

Answer 1

3 is zero of polynomial 2x^2+x+k

i.e.,x=3

2(3)^2 + 3 + k =0

2(9) + 3 +k=0

18+3 +k =0

21+k=0

k=-21

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