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Multiple choice

Solve the equation $6{ x }^{ 4 }+29{ x }^{ 3 }+40x^2+7x-12=0$, the product of two roots being $2$.

  1. $-\dfrac {4}{3},-\dfrac {3}{2},\dfrac {-1\pm \sqrt 2}{3}$
  2. $-\dfrac {4}{3},-\dfrac {3}{2},\dfrac {-2\pm \sqrt 8}{2}$
  3. $-\dfrac {4}{3},-\dfrac {3}{2},\dfrac {-2\pm \sqrt 6}{2}$
  4. none

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