Bonjour,
1) Développer puis réduire E :
E = (7x - 3)² - (3 + 2x) (7x - 3)
E = 49x² - 42x + 9 - (21x - 9 + 14x² - 6x)
E = 49x² - 42x + 9 - 21x + 9 - 14x² + 6x
E = 49x² - 14x² - 42x - 21x + 6x + 9 + 9
E = 35x² - 57x + 18
2) Factoriser E :
E = (7x - 3) [(7x - 3) - (3 + 2x)]
E = (7x - 3) (7x - 3 - 3 - 2x)
E = (7x - 3) (5x - 6)
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Bonjour,
1) Développer puis réduire E :
E = (7x - 3)² - (3 + 2x) (7x - 3)
E = 49x² - 42x + 9 - (21x - 9 + 14x² - 6x)
E = 49x² - 42x + 9 - 21x + 9 - 14x² + 6x
E = 49x² - 14x² - 42x - 21x + 6x + 9 + 9
E = 35x² - 57x + 18
2) Factoriser E :
E = (7x - 3)² - (3 + 2x) (7x - 3)
E = (7x - 3) [(7x - 3) - (3 + 2x)]
E = (7x - 3) (7x - 3 - 3 - 2x)
E = (7x - 3) (5x - 6)