Réponse :
Bjr,
2.
(3 x - 2)² = 9 x² - 12 x + 4
(5 x - 3) (5 x + 3) = 25 x² - 9
(10 x + 2)² = 100 x² + 40 x + 4
3.
81 x² - 36 x + 4 = (9 x - 2)²
16 x² - 25 = (4 x + 5) (4 x - 5)
49 x² + 112 x + 64 = (7 x + 8)²
x² + 20 x + 100 = (x + 10)²
9 x² - 36 = (3 x + 6) (3 x - 6)
ou 9 x² - 36 = 9 (x² - 4) = 9 (x + 2) (x - 2)
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Réponse :
Bjr,
2.
(3 x - 2)² = 9 x² - 12 x + 4
(5 x - 3) (5 x + 3) = 25 x² - 9
(10 x + 2)² = 100 x² + 40 x + 4
3.
81 x² - 36 x + 4 = (9 x - 2)²
16 x² - 25 = (4 x + 5) (4 x - 5)
49 x² + 112 x + 64 = (7 x + 8)²
x² + 20 x + 100 = (x + 10)²
9 x² - 36 = (3 x + 6) (3 x - 6)
ou 9 x² - 36 = 9 (x² - 4) = 9 (x + 2) (x - 2)