Which of the following is INCORRECT for the hyperbola `x^(2)-2y^(2)-2x+8y-1=0`

The foci of the hyperbola 4x^(2)-9y^(2)-1=0 are

The foci of the hyperbola 4x^(2)-9y^(2)-1=0 are

Which of the following line is a diameter of the circel x ^(2) + y^(2) -6x-8y-9=0 ?

The centre of the hyperbola y^(2)-4x^(2)-8y-24x-24=0 is

Which of the following is a point on the common chord of the circle x^(2)+y^(2)+2x-3y+6=0 and x^(2)+y^(2)+x-8y-13=0

Which of the following is a point on the common chord of the circle x^(2)+y^(2)+2x-3y+6=0 and x^(2)+y^(2)+x-8y-31=0?(1,-2)(b)(1,4)(1,2)(d)1,4)