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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