The condition for equation ax2 + bx + c = 0 to be linear is
a > 0, b =0
a = 0, b ≠ 0
a < 0, b = 0
a ≠ 0, b = 0
If a = 0 and b is not equal to 0, then ax2 + bx + c = 0 reduces to
bx +c which is a linear equation.
The condition for equation ax2 + bx + c = 0 to be quadratic is
Condition for ax2 + bx + c = 0 to be a quadratic equation is