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Sagot :

Bonjour,

(3x+4)-(x²-4x+2) = 3x+4-x²+4x-2 = -x²+7x+2

-(x+3)+x²-x+2 = -x-3+x²-x+2 = x²-2x-1

-(x²-2)+(3x²+4x) = -x²+2+3x²+4x = 2x²+4x+2

MARIEJOE57

Réponse :

bonjour

Explications étape par étape :

a. (3x+4)-(x²-4x+2)

=3x+4 -x²+4x-2

=-x² +7x +2

b.  -(x+3) + x²-x+2

=-x-3+x²-x+2

=x²-2x-1

c. -(x²-2)+(3x²+4x)

=-x²+2+3x²+4x

=2x²+4x+2

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