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If `alpha, beta` are the roots of ` a x^2 + bx + c = 0` and `k in R` then the condition so that `alpha < k < beta` is : |
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Answer» a>0 c=x f(x)<0 af(x)<0 `a^2k^2+abk+ac<0` a<0 c=x f(k)>0 af(x)<0 option 4 is correct. |
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