Question

Find the equation of the hyperbola whose eccentricity is 2, one focus is (1,1) and the corresponding directrix is (x+y+1)=0

Answer 1

Please put a perpendicular from {1,1}to line ,x+y+1=0and it will be equal to a/e=3/√2
Thus a=3√2&b=3√6
Find the eq by putting in hyperbolic standard eq,thanks