If the foci of the ellipse `9x^(2)+25y^(2)-36x+50y=164` are `(x_(1),y_(1))` and `(x_(2),y_(2))` then `x_(1)+x_(2)+y_(1)-y_(2)`=

The foci of the ellipse (x^(2))/(4) +(y^(2))/(25) = 1 are :

If the ends of a focal chord of the parabola y^(2) = 8x are (x_(1), y_(1)) and (x_(2), y_(2)) , then x_(1)x_(2) + y_(1)y_(2) is equal to

The centre of the ellipse 9x^(2)+25y^(2)-18x-100y-160=0 is

The coordinates of the ends of a focal chord of the parabola y^(2)=4ax are (x_(1),y_(1)) and (x_(2),y_(2)). Then find the value of x_(1)x_(2)+y_(1)y_(2)

Find the foci of the ellipse 25(x+1)^(2)+9(y+2)^(2)=225

If the tangent at point P(h, k) on the hyperbola (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 cuts the circle x^(2)+y^(2)=a^(2) at points Q(x_(1),y_(1)) and R(x_(2),y_(2)) , then the vlaue of (1)/(y_(1))+(1)/(y_(2)) is