On considère l'expression F= (6a+3) (2a-3) - (3a-5) (4a-3)
a) developpe et reduis l'expression f
b)calcule l'exrpession f pour a = -2
c)resoudre l'equation f=-109
a) developpe et reduis l'expression f
b)calcule l'exrpession f pour a = -2
c)resoudre l'equation f=-109
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Verified answer
1)F= (6a+3) (2a-3) - (3a-5) (4a-3)
f=12a²-18a+6a-9-12a²+9a+20a-15
f=17a-24
2)
f=17×-2-24
f=-34-24
f=-78
3)
f)17a-24=-109
17a=-109+24
17a=-85
a=-85/17
Verified answer
Bonjour,F = 17a-24
c)resoudre l'equation f=-109
17a-24 = -109
17a = -109+24
17a = -85
a = -5