Pour demain : Développer et réduire les expressions suivantes :
A = (x + 6)² B = (x - 3)² C = (4y - 5)² D = (5x + 2) (5x - 2)
Exemples : (a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
(a + b) (a - b) = a² - b²
A = (x + 6)² B = (x - 3)² C = (4y - 5)² D = (5x + 2) (5x - 2)
Exemples : (a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
(a + b) (a - b) = a² - b²
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A= x² + 12x + 36
B= (x - 3)²
B= x² - 6x + 9
C= (4y - 5)²
C= 16y² - 40y + 25
D= (5x + 2)(5x - 2)
D= 25x² - 4