Does there exist a quadratic equation

Question:

Does there exist a quadratic equation whose coefficients are rational but both of its roots are irrational? Justify your answer.

Solution:

Yes, consider the quadratic equation $2 x^{2}+x-4=$ Owith rational coefficient. The roots ofthe given quadratic equation are $\frac{-1+\sqrt{33}}{4}$

and $\frac{-1-\sqrt{33}}{4}$ are irrational.

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