1) x² + 6x + 9 = x² + 2 * 3 * x + 3² = (x + 3)² = ( x + 3)(x + 3)
2) 15a³b - 3a²b³ = 3a²b(5a - b²)
3) 49m⁴ - 25n² = (7m²)² - (5n)² = (7m² - 5n)(7m² + 5n)
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1) x² + 6x + 9 = x² + 2 * 3 * x + 3² = (x + 3)² = ( x + 3)(x + 3)
2) 15a³b - 3a²b³ = 3a²b(5a - b²)
3) 49m⁴ - 25n² = (7m²)² - (5n)² = (7m² - 5n)(7m² + 5n)