Find the value of polynomial 2x+r when xa-3
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Answer:
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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