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Sagot :

Alors, 

= x²+8x+16-(x²+8x+2x+16)

=x²+8x+16-x²-10x-16

=2x

 

     X² + 8x + 16 - (x² + 10x + 16)

=  x² + 8x + 16 -x² -10x -16

= -2x

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