1. x ^ 2 hadning kvadratini to'ldiring va quyidagilarni oling: x ^ 3 + 2x ^ 2 - x - 1 = (x ^ 2 + x - 1) - 1 2. Chap tomonni faktorizatsiya qiling va quyidagilarni oling: (x ^ 2 + x - 1) - 1 = (x - 1) (x + 1) - 1 3. Ikkala tomonni (x - 1) ga bo'ling va quyidagilarni oling: x + 1 = -2 4. Kvadrat tenglamani yeching va quyidagilarni oling: x = -3 yoki x = 1 Shunday qilib, echimlar: x = -3, 1
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