Mark the statement equivalent to 12 less than the product of x and y.
Equation of the hyperbola with focus (-3,4) directrix 3x-4y+5=0 and e = 52 is
Find the equations of transverse common tangents for two circles
x2 + y2 + 6x − 2y + 1 =0 , x2 + y2 − 2x − 6y + 9 = 0