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f(x) = 2x+1 (ax+b) ⇒ a = 2 b= 1
f pangkat -1 atau invers = x-b/a
= x-1/2
maka f pangkat -1(4) = 4-1/2
= 3/2
ituh sih kalau ikutin rumus fungsi invers ,
tapi tidak ada di jawaban ,,
coba di cek kembali :)