Math, asked by sijojosephkulathinka, 1 month ago

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Answered by Anonymous

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Answer:

using remainder theorem

x = 3

x^3 + 2x^2 + kx + 3 = 21

(3)^3+2 (3)^2 + k (3) + 3 = 21

27 + 18+ 3k + 3 = 21

3k = 21-48

3k = - 27

k = -27/3

k = -9

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