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Multiple choice

If a,b,c are real numbers such that $ \cfrac {3a+2b} {c+d} + \cfrac {3} {2} = 0 $ then the equation $ {ax} ^{3} + {bx}^{2} +cx+d =0 $has

  1. at least one root in $ [-2,0] $
  2. at least one root in $ [0,2] $
  3. at least two root in $ [-2,2] $
  4. No root in $ [-2,2] $
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D Correct answer

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