If a,b,c are in GP, then the equation ax^2+2bx+c=0 and dx^2+2ex+f=0 have a common root, if da, eb, fc are in

JEE Main Mathematics question

If are in GP, then the equation and have a common root, if are in

Answer: (A)

makes the discriminant of the first equation , so its (double) root is . This must satisfy the second: ; using ,

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Question ID VK-013549