please friends answer this question
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Equal roots
=> discriminant = 0
=> [ 2(ac+bd) ]² - 4(a²+b²)(c²+d²) = 0
=> (ac+bd)² - (a²+b²)(c²+d²) = 0
=> a²c² + b²d² + 2abcd - a²c² - a²d² - b²c² - b²d² = 0
=> 2abcd - a²d² - b²c² = 0
=> a²d² + b²c² - 2abcd = 0
=> (ad - bc)² = 0
=> ad = bc
=> a/b = c/d
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