factoriser les expressions: A=4x-4y B=49a-7b C=3x²+7x A=3x²+6x B=36-6x C=7x+5x²​

Exercice 1

• A=4x-4y =4 (x-y)
• B=49a-7b = 7(7a-b)
• C=3x^2 +7x= x (3x +7)

Exercice 2

• A=3x^2 +6x = x (3x +6)
• B=36-6x =6 (6-x)
• C=7x+5x^2 = x (7+5x)

Voilà :)

Réponse:

1)A = 4x-4y

= 4×x-4×y

= 4(x-y)

B = 49a -7b

= 7×7×a -7×b

= 7(7a-b)

C = 3x² +7x

= 3×x×x +7×x

= x(3x +7)

2) A = 3x²+6x

= 3×x×x +3×2×x

= 3x(x+2)

B = 36 -6x

= 6×6 -6×x

= 6(6-x)

C = 7x+5x²

= 7×x+5×x×x

= x(7+5x)