Réponse:
1-a) (7x+14)×(3x+6) + (3x+6)×(5x+10-3x+6)
b) = (21x^2 + 84x + 84) + (3x+6)×(2x+16)
= 21x^2 + 84x + 84 + 6x^2 + 60x + 96
= 27x^2 + 144x + 180
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Réponse:
1-a) (7x+14)×(3x+6) + (3x+6)×(5x+10-3x+6)
b) = (21x^2 + 84x + 84) + (3x+6)×(2x+16)
= 21x^2 + 84x + 84 + 6x^2 + 60x + 96
= 27x^2 + 144x + 180