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f(x+1)= 2(x+1)^2 + (x+1) -6
f(x+1)= 2(x^2 +2x+1) + x -5
f(x+1)= 2x^2 +4x +2 +x -5
f(x+1)= 2x^2 +5x -3
maap klo salah