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Multiple choice

Find the quadratic equation whose roots are $\displaystyle 9-\sqrt { 5 } ,9+\sqrt { 5 } $

  1. $\displaystyle { x }^{ 2 }-18x-56=0$
  2. $\displaystyle { x }^{ 2 }+18x+56=0$
  3. $\displaystyle 4{ x }^{ 2 }-72x-56=0$
  4. $\displaystyle { x }^{ 2 }-18x+56=0$
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