Which of the following is not a quadratic equation?
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).