ABDOUFADHUL07
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vous pouvez m'aide svp Exercice 2: Factorise chaque expression. A= 5x+ 2x+ 10x B =9x(x - 3) + 9x(10 + 2x) C = (2x + 1)(8 + x) - (3x - 1)(2x + 1) D=x2-9​

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Bonsoir

A= 5x+ 2x+ 10x

= x(5+2+10)

= x( 17) = 17x

B =9x(x - 3) + 9x(10 + 2x)

9x( x-3 +10+2x )

= 9x ( 3x +7)

C = (2x + 1)(8 + x) - (3x - 1)(2x + 1)

= (2x+1) ( 8+x -3x +1)

= (2x+1) ( -2x +9)

D=x²-9​

(x-3) (x+3)

identité remarquable