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2. 9x² - 1 = ( 3x + 1 ) ( 3x - 1 ) ⇒ BENAR
3. 2x² - 7x - 15 = ( 2x - 3 ) ( x + 5 ) ⇒ SALAH
seharusnya
2x² - 7x - 15 = ( 2x + 3 ) ( x - 5 )