What is the value of K when the equation (x ^ 2-4) k-4x ^ 2 + KX + 1 = 0 is a quadratic equation of one variable about x~~

What is the value of K when the equation (x ^ 2-4) k-4x ^ 2 + KX + 1 = 0 is a quadratic equation of one variable about x~~

If it is a quadratic equation of one variable about X, then we need to ensure that the coefficient of the quadratic term is not zero. Then K is not equal to four, which is the correct answer