Réponses

2013-10-24T17:12:36+02:00
Identité remarquable!
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
a²-b²=(a-b)(a+b)
2013-10-24T17:33:52+02:00
Bonjour

(2+4x)² = 4 + 16x + 16x²
(x-7)² = x² - 14x +49
(8x-2)(8a+2) = 64x² -4
(7x+5)(7x-5) = 49x² -25
(9-9x)² = 81 - 162x +81x²
(10+5x)²
= 100 + 100x + 25x²