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f(g(x)) = 2x²-10x+3
f (x²-5x+2) = 2x²-10x+3
f (x²-5x+2) = 2 (x²-5x+2) - 1
f (x) = 2x - 1
invers f (x)
f (x) = 2x - 1
y = 2x - 1
2x = y + 1
x = (y+1)/2
f^-1 = (x+1)/2