Question

18- For what value of K, is 3 a root of the equation 2x² + x + K = 0​

Answer 1

Answer:

this is the answer for your question

Answer 2

Answer:

-21

Step-by-step 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