Bonsoir jai besoinFactoriser les expressions suivantes en trouvant un facteur commun :
a) 15x-21
b) 8x²-12x
c) (x-1)(2x+3)+(5x-4)(x-1)
a) 15x-21
b) 8x²-12x
c) (x-1)(2x+3)+(5x-4)(x-1)
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a) 15x - 21 = 3*5x - 3*7 = 3 (5x - 7)
b) 8x² - 12x = 4x*2x - 4x*3 = 4x (2x - 3)
c) (x-1)(2x+3)+(5x-4)(x-1) = (x-1) (2x+3 + 5x-4) = (x-1) (7x-1)