Which one is the quadratic equation?

Out of the following equations which one is nota quadratic equation ?

Choose the correct answer for the following questions. (ii) Out of the following equation which one is not a quadratic equation?

Out of the following equations, which one is not a quadratic equation? a) x^2+4x=11+x^2 b) x^2=4x c) 5x^2=90 d) 2x-x^2=x^2+5

Which is the quadratic equation?

Out of the following equations which one is not a quadratic equation ?

Out of the following equations which one is not a quadratic equation ?

Find the value of k, for which one root of the quadratic equation kx^(2)--14x+8=0 is 2.