Browse · MATH Print → jmc algebra intermediate Problem A certain ellipse is defined by PF1+PF2=d.The equation of the ellipse is 4x2−8x+y2+4y−8=0. Find d. Solution — click to reveal Completing the square in x and y, we get 4(x−1)2+(y+2)2=16.Then 4(x−1)2+16(y+2)2=1.Hence, d=2⋅4=8. Final answer 8 ← Previous problem Next problem →