Question 1126944
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The Vieta's formula (theorem) says that the product of two roots of this quadratic equation is the constant term:


    {{{alpha}}}.{{{beta}}} = {{{-3*sqrt(2)}}}.


Since one of the roots is  {{{sqrt(2)}}},  the other root is  {{{(-3*sqrt(2))/sqrt(2)}}} = -3.


Exactly as the other tutor states - but with an appropriate explanation.
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