Question

Which of the following are quadratic equation in x? 

`x-6/x=3` 

Answer 1

`x-6/x=3` 

⇒` x^2-6=3x` 

⇒` x^2-3x-6=0` 

`(x^3-3x-6)` is not quadratic polynomial; therefore, the given equation is quadratic.