If $\alpha+\beta=-2$ and $\alpha^3+\beta^3=-56$,then the quadratic equation whose roots are $\alpha$ and $\beta$ is

  • A
    $x^2+2x-16=0$
  • B
    $x^2+2x+15=0$
  • C
    $x^2+2x-12=0$
  • D
    $x^2+2x-8=0$

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