Factorize:
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9x² + 6x +1-25y²
= (3x)² + 2 × 3x × 1 + (1)² − (5y)²
= (3x + 1)² – (5y)². (a² − b² = (a + b) (a − b)
= (3x + 1 + 5y) (3x + 1-5y)
= (3x)² + 2 × 3x × 1 + (1)² − (5y)²
= (3x + 1)² – (5y)². (a² − b² = (a + b) (a − b)
= (3x + 1 + 5y) (3x + 1-5y)
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