F (x) Is A Polynomial Of Degree 4 With Real Coefficients Such That f (x) = 0 Is Satisfied By x = 1, 2, 3 Only, Then f’(1). f’(2). f’(3) Is Equal To:

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Question

f (x) is a polynomial of degree 4 with real coefficients such that f (x) = 0 is satisfied by x = 1, 2, 3 only, then f’(1). f’(2). f’(3) is equal to:

Solution

Correct option is

0

f (x) = 0 has roots 1, 2, 3 only   

⇒ Any one of 1, 2 or 3 is a repeated root of (x) = 0    

  

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