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= (1 + x)(1 - x)(1 + x²)
2) (a + b)² - (a - b)²
= (a + 2ab + b²) - (a² - 2ab + b²)
= 4ab
3) a²b² - 4c² = (ab - 2c)(ab + 2c)
4) (x²y - 3xy²)/xy = x - 3y
5) (2x³ - 3x²) / -x = - 2x² + 3x
6) y² + 12y + 32 = (y + 4)(y + 8)