Bonjour,
A = (3x + 1)² - (2x + 4) (3x - 9)
A = 9x² + 6x + 1 - 6x² + 18x - 12x + 36
A = 3x² + 12x + 37
B = (4x - 5)² - 5x (x + 3)
B = 16x² - 40x + 25 - 5x² - 15x
B = 11x² - 55x + 25
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Bonjour,
A = (3x + 1)² - (2x + 4) (3x - 9)
A = 9x² + 6x + 1 - 6x² + 18x - 12x + 36
A = 3x² + 12x + 37
B = (4x - 5)² - 5x (x + 3)
B = 16x² - 40x + 25 - 5x² - 15x
B = 11x² - 55x + 25