Bonjour, factorizer les expressions suivantes a laides des identité remarquable(marquer toutes les etape): A=xaucarré +2x +1 B= 25xaucarré - 30x +9 C 36xaucarré

A=xaucarré +2x +1         (a+b)² = a²+2ab+b²
A= (x+1)²

B= 25xaucarré - 30x +9      (a-b)² = a²-2ab+b²
B =(5x)²-2*5x*3+3²
B = (5x-3)²

C 36xaucarré -49                  a²-b² = (a+b)(a-b)
C = (6x)²-7²
C = (6x+7)(6x-7)

D= 4xaucarré + 20x +25          (a+b)² = a²+2ab+b²
D = (2x)²+2*2x*5+5²
D = (2x+5)²

E= 100xaucarré -9           a²-b² = (a+b)(a-b)
E =(10x)²-3²
E = (10x+3)(100x-3)

F= 28x + 4xaucarré +49        (a+b)² = a²+2ab+b²
F = (2x)²+2*2x*7+7²
F = (2x+7)²

G=(x+2)aucrré -25               a²-b² = (a+b)(a-b)
G = (x+2)²-5²
G = (x+2+5)(x+2-5)
G = (x+7)(x-3)

H= 36- (x+1)aucarré          a²-b²
H = 6²-(x+1)²
H =  (6+x+1)(6-x-1)
H = (7+x)(5-x)

I= (3x+2)aucarré -(x-7)aucarré       a²-b²
I = (3x+2+x-7)(3x+2-x+7)
I = (4x-5)(2x+9)