A quadratic equation has degree

A polynomial equation x(x+1) + 8 = (x+2) (x-2) is

The sum of roots of quadratic equation  $3x^2\ -\ 9x\ +\ 5\ =\ 0$  is 

The roots of equation  $7x^2\ +\ x-1$  are

The equation  $12x^2+4kx+3\ =\ 0$  has real and equal roots if,