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Dear Dipankar,Taking 2^x=m and solving the quadratic for getting D>=0we get range= [3/4 , infinity )ANSRegards.
Actually the answer is (1,infinity)
hi dipankar
domain of f(x) is (- infinity to + infinity ) and f(x) is INCREASING FUNCTION
so the minimum value of f(x) will be f(- infinity ) that will be 1
and max value will be + infinite we know max value of a^x is + infinite
so the range is [ 1 , infinity[
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