Question

Find the value of k for which 3 is a zero of polynomial 2x2 + x + k.​

Answer 1

Answer:

k = -21

Explanation:

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