43. Range of f(x) = 4* + 2x + 1 is (a) (0,0) (b) (1.) (c) (2 ) (d) (3,)

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( f(x)=4^{x}+2^{x}+1 ) ( =left(2^{x}right)^{2}+2^{x}+1 ) ( f(x)=t^{2}+t+1 quadleft(t=2^{x}right) ) ( f(x)=t^{2}+t+1 ) [ -4 cdot 1 cdot 1=-3<0 ]

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