What is the condition for ax2+2hxy+by2+2gx+2fy+c=0ax^2 + 2hxy + by^2 + 2gx + 2fy + c = 0ax2+2hxy+by2+2gx+2fy+c=0 to represent a pair of straight lines?
abc+2fgh−af2−bg2−ch2=0abc + 2fgh - af^2 - bg^2 - ch^2 = 0abc+2fgh−af2−bg2−ch2=0
h2−ab=0h^2 - ab = 0h2−ab=0
h2−ab>0h^2 - ab > 0h2−ab>0
h2−ab<0h^2 - ab < 0h2−ab<0