Bonjour,
1) (5y + 6) (5y – 6) = 25y² - 36
2) ( 3x – 8)² = 9x² - 48x + 64
3) 25t² – 81 = (5t - 9) (5t + 9)
4) (2x + 1) (5x + 3) + (5x + 3) (4x – 5) = (5x + 3) (2x + 1 + 4x - 5) = (5x + 3) (6x - 4) = 2 (3x - 2) (5x + 3).
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Bonjour,
1) (5y + 6) (5y – 6) = 25y² - 36
2) ( 3x – 8)² = 9x² - 48x + 64
3) 25t² – 81 = (5t - 9) (5t + 9)
4) (2x + 1) (5x + 3) + (5x + 3) (4x – 5) = (5x + 3) (2x + 1 + 4x - 5) = (5x + 3) (6x - 4) = 2 (3x - 2) (5x + 3).