Question

Find the value of k so that 3 is a zero of the polynomial 2x + x + k​

Answer 1

Answer:

-9

Step-by-step explanation:

p(x) =2x+x+k

X=3

So,

p(3)=2×3+3+k

=6+3+k

=9+k

-9=k or k=-9

Hope it is helpful

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Answer 2

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