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Sagot :

Réponse :

1)

-1

-1*4=-4

-4+8=4

4*2=8

2) x nombre de depart

x*4=4x

4x+8

2(4x+8)=8x+16

8x+16=30

8x=30-16

x=7/14 = 1,75

3) A = 2(4x+8) = 8x+16

B=(x+4)²-x² =x²+8x+16-x² = 8x+16

4) oui car le resultat = 8x+16 (8x positif)

ou 8x+16 =8(x+2)

Explications :

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