f(t)---?
f(2x+1) = ... ---> 2x+1 = t
x = (t-1)/2
f(t) = (t-1)²/4 - 3(t-1)/2 = (1/4)*(t²-2t+1-6t+6) = 0.25(t²-8t+7)
f(x) = (x²-8x+7) / 4
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f(t)---?
f(2x+1) = ... ---> 2x+1 = t
x = (t-1)/2
f(t) = (t-1)²/4 - 3(t-1)/2 = (1/4)*(t²-2t+1-6t+6) = 0.25(t²-8t+7)
f(x) = (x²-8x+7) / 4