My title-my wish-"Every human activity, EXCEPT Mathematics, must come to an end." -erdös
Geometry
Level
pending
The general equation ax²+2hxy+by²+2gx+2fy+c=0 represents a pair of intersecting straight lines iff, (Where ☆=abc+2fgh-af²-bg²-ch²).
☆>0 and h²=ab
☆=0 and h² greater than or equal to ab
☆=0 and h²-ab<0
☆=0 or h²>ab ,g²>ac ,f²>bc
☆=0 and h²>ab
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