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Question

If 1,m and k are the roots of the cubic polynomial whose sum is 5 and sum of product of roots taken two at a time is 8, then value of (m-k) is,


A

0

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B

1

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C

2

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D

3

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Solution

The correct option is A

0


Adding 1+m+k we get 5, and taking the sum of product of roots two at a time: m+k+mk = 8, m+k=4 and mk=4

Only number 2 is satisfied, so m-k=0.


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