If f (2x + 1) = x ^ 2 + 3x + 1, then the analytic expression of F (x) is?

f(2x+1)=x^2+3x+1 =1/4 (2x+1)^2 + (2x+1) - 1/4
f(x) = 1/4 x^2 + x -1/4

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