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Sagot :

NBA10

Réponse :

A= (x+3)^2 - (x+1)^2​ = ( x+3 - (x+1) )  ( x+3 + (x+1) )  = ( x+3 -x-1 )  ( 2x + 4 )

= 2 ( 2x + 4 ) = 2*2 ( x +2 ) = 4 ( x + 2 )

voila :))

Réponse :

A= (x+3)^2 - (x+1)^2​

A= (x+3)(x+3) - (x+1)(x+1)

A= x²+6x+9 - [x²+2x+1]

A= x²+6x+9-x²-2x-1

A= 4x+8

A = 4× x + 4×2

A= 4(x+2)

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