Bonjour,
F = (3x - 5)² - (3x - 5)(x + 4)
F = (9x² - 30x + 25) - (3x² + 12x - 5x - 20)
F = 9x² - 30x + 25 - 3x² - 7x + 20
F = 6x² - 37x + 45
F = (3x - 5)(3x - 5) - (3x - 5)(x + 4)
F = (3x - 5)(3x - 5 - x - 4)
F = (3x - 5)(2x - 9)
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Bonjour,
F = (3x - 5)² - (3x - 5)(x + 4)
F = (9x² - 30x + 25) - (3x² + 12x - 5x - 20)
F = 9x² - 30x + 25 - 3x² - 7x + 20
F = 6x² - 37x + 45
F = (3x - 5)² - (3x - 5)(x + 4)
F = (3x - 5)(3x - 5) - (3x - 5)(x + 4)
F = (3x - 5)(3x - 5 - x - 4)
F = (3x - 5)(2x - 9)