If , then which one of the following is negative? (I) (II) (III) (A) I only (B) II only (C) III only (D) I and II only (E) I and III only Thanks
All of the choices can be interpreted as quadratic inequalities with roots . The leading coefficient(s) for (I) and (III) are positive while for (II) is negative. Therefore, for (I) and (III) we have the following sign diagram ---(+)--------{-4}---------(-)-------------{1}-------(+)--------- While for (II) we have the following sign diagram ---(-)--------{-4}---------(+)-------------{1}-------(-)--------- Therefore the correct answer is (E). Hope these help!!
Thanks a lot for your reply!!
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