Question

For what value k is 3 is a zero of polynomial of 2x^2+x+k

Answer 1

Heya !!!



P(X) = 2X² + X + K



P(3) = 2 × (3)² + 3 + K




=> 2 × 9 + 3 + K = 0




=> 21+ K = 0



=> K = -21


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Answer 2

2(3)^2+3+k=0
18+3+k=0
k=-21