Problem

Problem

Range of f(x)=4x+2x+1f(x) = 4^x + 2^x + 1 is (a) (0,∞)(0, \infty) (b) (1,∞)(1, \infty) (c) (2,∞)(2, \infty) (d) (3,∞)(3, \infty)

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