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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