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= (3x+2)(x+2)
2. 12x² - 8x + 1
= (6x-1)(2x-1)
3. 10a² - 43a + 12
= (10a-3)(a-4)
4. 2y² + 5y - 3
= (2y-1)(y+3)
5. Soal tidak valid !