Check whether the equations are quadratic or not?
`x^(2)-6x-4=0`

Check whether the equations are quadratic or not? 7x=2x^(2)

Check whether the equations are quadratic or not? 3y^(2)=192

Check whether the equations are quadratic or not? x^(3)-6x^(2)+2x-1=0

Check whether the equations are quadratic or not? x^(2)+(1)/(x^(2))=2(x ne0)

Check whether the equations are quadratic or not? (2x+1)(3x+1)=(x-1)(x-2)

Check whether the following are quadratic equation: (x-2)^(2)+1=2x-3

Chek whether the following are quadratic equation: x^(2)-2x=(-2)(3-x)

Show that if one of the roots of the equation of the quadratic polynomial x^(2)-6ax-91=0 be 7, then the another root is (-13).

Chek whether the following are quadratic equation: x^(3)-4x^(2)-x+1=(x-2)^(3)

Chek whether the following are quadratic equation: x^(2)+3x+1=(x-2)^(2)