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1 - 4/x + 4/x² → 1 x 4 (Kalikan konstanta dengan koefisien x²)
4 (Cari perkalian yang hasilnya 4 jika dijumlahkan hasilnya - 4)
1 x 4
2 x 2
1 - 4/x + 4/x² = 0
1 - 2/x - 2/x + 4/x² = 0
1(1 - 2/x) - 2/x(1 - 2/x) = 0
(1 - 2x)(1 - 2x) = 0
1 - 2x = 0
- 2x = - 1
x = -1/-2
x = 1/2
Maka
2/x²
2/(1/2)²
2/(1/2)(1/2)
2/(1/4)
2 x 4/1
8