Question

for what value of k,is 3 a zero of polynomial 2x²+x+Kx
​

Answer 1

For what value of k is 3 a zero of the polynomial ? Put x=3 in the equation, Therefore, the value of k is -21

Given p(x)=2x

2

+x+k

x=3

Put x=3

⇒p(3)=2(3)

2

+(3)+k

⇒2(3)

2

+(3)+k=0

⇒2.9+3+k=0

⇒18+3+k=0

⇒21+k=0

⇒k=-21

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