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f(x+1) = 2(x+1)^2-(x+1)+3
= 2(x^2+2x+1)-x-1+3
= 2x^2+4x+2-x-1+3
f(x) = 2x^2+3x+4x (A)
ini soal untuk tes masuk salah satu Sekolah Tinggi kah ?