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- Développer et réduire les expressions suivantes : A = (x - 7) (2x + 9) B = (5x + 8) (-7x + 2) C = (3x – 1) (10 -x) svp les réponses merciiiiiiii​

Sagot :

Bonjour,

A = (x - 7) (2x + 9)

= 2x² +9x -14x -63

= 2x² -5x -63

B = (5x + 8) (-7x + 2)

= -35x² +10x -56x +16

= -35x² -46x +16

C = (3x – 1) (10 -x)

= 30x -3x² -10 +x

= -3x² +31x -10

C0C0LPT2006

Réponse :

A= 2x²-5x-63

B=-35x²-46x+16

C=-3x²+31x-10

Explications étape par étape :

A = (x - 7) (2x + 9)

A= 2x²+9x-14x-63

A=2x²-5x-63

B=(5x + 8) (-7x + 2)

B=-35x²+10x-56x+16

B=-35x²-46x+16

C= (3x – 1) (10 -x)

C=30x-3x²-10+x

C=-3x²+31x-10

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