bjr
je factorise avec a² - b² = (a+b) (a-b)
(3x+1)² - (2x+5)² = (3x+1 + (2x+5)) (3x+1-(2x+5))
= (3x+1+2x+5) (3x+1-2x-5)
= (5x + 6) (x - 4)
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bjr
je factorise avec a² - b² = (a+b) (a-b)
(3x+1)² - (2x+5)² = (3x+1 + (2x+5)) (3x+1-(2x+5))
= (3x+1+2x+5) (3x+1-2x-5)
= (5x + 6) (x - 4)