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pers itu kk buat seperti ini
jika x²-x+1 = a maka
artinya nilai a hanya bernilai 1 , karena berapapun b, nilai log 1 =0
sehingga
a = 1
x²-x+1 = 1
x²-x = 0
x (x-1) = 0
x₁=0 atau x-1 = 0
x₂ = 1
sehingga hasil kali akar2 = x₁. x₂ = 0. 1 = 0