Réponse :
A = 4(3a - 7) - 6(2a - 4)
A = 12a-21-(12a-24)
A= 12a-21-12a+24=3
B = -6(2a - 5) + 5(3a - 7)
B = -12a+30+15a-35
B = 3a-5
C = 6(3a² - 5a - 5) - 7(-4a² - 5a + 7)
C = 18a²-30a-30-(-28a²-25a+49)
C = 18a²-30a-30+28a²+25a-49
C = 46a²-5a-79
Explications étape par étape :
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Réponse :
A = 4(3a - 7) - 6(2a - 4)
A = 12a-21-(12a-24)
A= 12a-21-12a+24=3
B = -6(2a - 5) + 5(3a - 7)
B = -12a+30+15a-35
B = 3a-5
C = 6(3a² - 5a - 5) - 7(-4a² - 5a + 7)
C = 18a²-30a-30-(-28a²-25a+49)
C = 18a²-30a-30+28a²+25a-49
C = 46a²-5a-79
Explications étape par étape :