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Q.

lf α and β(α<β),are the roots of the equation x2+bx+c=0, where c < 0 < b, then

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a

0<α<β

b

α<0<β<|α|

c

α<β<0

d

α<0<|α|<β

answer is B.

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Detailed Solution

∵ α+β=−b,αβ=c   ... (i)∵ c<0⇒αβ<0Let α<0,β>0∴ |α|=−α and α<0<β[∵α<β]  ... (ii)From Eq. (i), we get −|α|+β<0 ⇒ β<|α|                                         ... (iii)From Eqs. (ii) and (iii), we getα<0<β<|α|
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lf α and β(α<β),are the roots of the equation x2+bx+c=0, where c < 0 < b, then