If all real values of x obtained from the equation 4^x-(a-3)2^x+a-4=0 are nonpositive then

JEE Advanced Mathematics question

If all real values of obtained from the equation

-(a-+a-4=0

are nonpositive then

Answer: (A)

Put : . Sum of coefficients , so it factors as : - (nonpositive ✓). - gives a real only

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Question ID VK-107984