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## Answers

substitute -3 in the equation and equate it to 0

(k-1)x²+kx+1=0

⇒(k-1)(-3)²+k(-3)+1=0

⇒9k-9-3k+1=0

⇒6k-8=0

⇒k=4/3

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Another way, perhaps more simple too:

When -3 is a root of a polynomial P(x) =