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if ax^2+12xy+9y^2=0 represents two coincident lines then find the value of "a"
for coincident lines, ax^2 +12xy +9y^2 should be a perfect square. upon completing the square,we get ax^2+12xy+9y^2
=(x√a +3y)2, from inspection, it is obvious that ax^2 =4x^2, a=4
if lines are coincident then h^2 = ab.
so, 12^2 = 9a
so a= 16
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