Find : `12^(2) -8^(2)`

Find the 12^(th) term of a G.P. whose 8^(th) term is 192 and the common ratio is 2.

The equations of the direcrtor cirlce of x^(2) //12 -y^(2)//8=1 is

Find 2-:(8)/(9)

Find the equation of the circle passing through (2,3) and concentric with the circle x^(2) + y^(2) + 8x + 12y + 15= 0

Find the equation of tangents to x^(2)+ y^(2) -4x + 6y - 12=0 which are parallel to x + 2y -8=0 .

Find the equation of tangents of the circle x^(2) + y^(2) - 8 x - 2y + 12 = 0 at the points whose ordinates are 1.