If the roots of equation x2+qx+p=0 are each 1 less than the roots of the equation x2+px+q=0, then (p+q) is equal to
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a
-2
b
-4
c
-5
d
-6
answer is B.
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Detailed Solution
Let the roots of the equation x2+qx+p=0 be α−1 and β−1 . α+β−2=−q----(1)(α−1)(β−1)=p------(2) Then roots of the equation x2+px+q=0 are α and β . α+β=−p-----(3)αβ=q-----(4) From (1) and (3), p−q=−2 From (2), αβ−(α+β)+1=p∴ q+p+1=p or q=−1 On solving, we get p=−3 .