Which of the following is quadratic expression for all
As we learnt in
Quadratic Expression
, where
Now,
In option (A), for a = 1,-1, coefficient of x2 becomes 0, so it is not a quadratic equation for all real values of a.
In option (C), for a = -2, coefficient of x2 becomes 0, so it is not a quadratic equation for all real values of a.
In option (D), for a = 1/2, coefficient of x2 becomes 0, so it is not a quadratic equation for all real values of a.
But in option (B), the coefficient of x2 will be never zero for any real value of a, so (B) will represent a quadratic equation for all