(x+5)² - (2x+7)²
→ cf 3e ID de type: A ² - B ² = (a+b)(a-b)
donc:
= (x+5+2x+7)(x+5-2x-7)
= (3x+12)(-x-2)
= 3(x+4)(-x-2)
Bonjour
(X+5+2x+7(x+5-2x-7)
(3x+12)(-x-2)
3(x+4)(-x-2)
-3(x+4)(x+2)
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Verified answer
(x+5)² - (2x+7)²
→ cf 3e ID de type: A ² - B ² = (a+b)(a-b)
donc:
(x+5)² - (2x+7)²
= (x+5+2x+7)(x+5-2x-7)
= (3x+12)(-x-2)
= 3(x+4)(-x-2)
Verified answer
Bonjour
(X+5+2x+7(x+5-2x-7)
(3x+12)(-x-2)
3(x+4)(-x-2)
-3(x+4)(x+2)