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The value of k for which x-1 is a factor of 4x^3 + 3x^2 - 4x + k, is  A. 3  B. 1  C. -2  D. -3

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The value of k for which x-1 is a factor of 4x3 + 3x2 - 4x + k, is 

A. 3 

B. 1 

C. -2 

D. -3

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1 Answer

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Best answer

Since, x - 1 is a factor of f (x) 

Therefore, 

f (1) = 0 

4 (1)3 + 3 (1)2 - 4 (1) + k = 0 

4 + 3 - 4 + k = 0 

k = - 3

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