Réponse :
Bonjour,
M = 3(4x + 7) + 4(2x - 9)
= 3*4x + 3*7 + 4*2x - 4*9
= 12x + 21 + 8x - 36
= 12x + 8x + 21 - 36
= 20x - 15
N = 7x(2x - 5) - x(2x - 5)
= 7x*2x - 7x*5 - (x*2x - x*5)
= 14x² - 35x - (2x² - 5x)
= 14x² - 35x - 2x² + 5x
= 14x² - 2x² - 35x + 5x
= 12x² - 30x
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Réponse :
Bonjour,
M = 3(4x + 7) + 4(2x - 9)
= 3*4x + 3*7 + 4*2x - 4*9
= 12x + 21 + 8x - 36
= 12x + 8x + 21 - 36
= 20x - 15
N = 7x(2x - 5) - x(2x - 5)
= 7x*2x - 7x*5 - (x*2x - x*5)
= 14x² - 35x - (2x² - 5x)
= 14x² - 35x - 2x² + 5x
= 14x² - 2x² - 35x + 5x
= 12x² - 30x