DJEDJOCATARINA
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Exercice 3: Calculer les expressions suivantes en utilisant k(a+b) = ka + kb A = 3(x+6) B=-3 (2x + 7) C=2(5-x) D= 2x (x + 4) E = -7 (1+x) F= 3x (15-x)​

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MOZI

Bonjour,

A = 3 (x + 6) = 3 × x + 3 × 6 = 3x + 18

B = -3 (2x + 7) = -3 × 2x - 3 × 7 = -6x - 21

C = 2 (5 - x) = 10 - 2x

D= 2x (x + 4) = 2x² + 8x

E = -7 (1 + x) = -7 - 7x = -7x - 7

F= 3x (15 - x)​ = 45x - 3x² = -3x² + 45x