If the equation $a x^{2}+h x y+b y^{2}=0$ represents a pair of coincident lines, then

If the equation $a x^{2}+h x y+b y^{2}=0$ represents a pair of coincident lines, then
  1. $h^{2}=2 a b$
  2. $h^{2}=4 a b$
  3. $h^{2}=8 a b$
  4. $h^{2}=a b$

Solution

This is by definition.

Asked in: MHT CET 2020 (13 Oct Shift 2)

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