Answer :

A.




This is a quadratic equation of the form hence i.e. of degree 2 (a ≠ 0, a, b, c are real numbers).


B.


using




This is a quadratic equation of the form i.e. of degree 2 (a ≠ 0, a, b, c are real numbers).


C. using




This is not quadratic since it is not of the form i.e. of degree 2 (a ≠ 0, a, b, c are real numbers).


D.


using




This is a quadratic equation of the form i.e. of degree 2 (a ≠ 0, a, b, c are real numbers).

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