Factoriser les expressions suivantes :
49x carré - 9
25x carré - 90x + 81
16x carré - 49
Merci
49x carré - 9
25x carré - 90x + 81
16x carré - 49
Merci
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Bonsoir,49x² - 9
= (7x - 3) (7x + 3)
25x² - 90x + 81
= (5x - 9)²
16x² - 49
= (4x - 7) (4x+ 7)