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Sagot :

Bonjour,

3 × (x - 7) = 3×x + 3×(-7) = 3x - 21

8 × (x + 1) = 8×x + 8×1 = 8x + 8

je te laisse conclure...

MARGESIMPSON1

Bonsoir,

1. A-t-on A = B ?

A) Développons :

A = 3(x - 7)

A = 3x - 3 × 7

A = 3x - 21

B = 3x - 21

On a donc A = B

B) Développons :

A = 8x + 11

B = 8(x + 1)

B = 8x + 8 × 1

B = 8x + 8

On a donc A ≠ B

Bonne soirée.

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