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Sagot :

[tex] - 2( - 3x + 1) = - 2 \times ( - 3x) + ( - 2) \times 1 = 6x - 2[/tex]

[tex](7x + 2)(3x - 4) = 7x \times 3x + 7x \times ( - 4) + 2 \times 3x + 2 \times ( - 4) = 21x {}^{2} - 28x + 6x - 8 = 21x {}^{2} - 22x - 8[/tex]

Réponse:

Bonjour

-2 × -3x + 1 × -2 ensuite faut calculer

7x × 3x - 7x × 4 + 2 × 3x - 2 × 4 et ensuite faut calculer

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