If $x^2-3x+2$ is a factor of $x^4-ax^2+b$,then the equation whose roots are $a$ and $b$ is

  • A
    $x^2-9x-20=0$
  • B
    $x^2-9x+20=0$
  • C
    $x^2+9x-20=0$
  • D
    $x^2+9x+20=0$

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