Sagot :
Bonjour,
A = (6x + 1)²
A = 36x² + 12x + 1
E = (9x - 7y)²
E = 81x² - 126xy + 49y²
Bonjour,
Rappels : identités remarquables
(a + b)² = a² + 2(ab) + b²
(a - b)² = a² - 2(ab) + b²
A = (6x + 1)² = (6x)² + 2(6x × 1) + 1²
A = 36x² + 2 × 6x + 1
A = 36x² + 12x + 1
E = (9x - 7y)²
E = (9x)² - 2(9x × 7y) + (7y)²
E = 81x² - 2 × 63xy + 49y²
E = 81x² - 126xy + 49y²
Bonne journée !