Simandradaask
a fost răspuns

determinati a apartine lei R pt care propozitiile de mai jos sunt adevarate  
a)ecuatia ax+a+1=0 are solutia x=2
b)ecuatia 3x-a+2=0 are solutia x=1supra 3

Răspuns :

Wolfiiask
a)3a+1=0=> a=-1/3
b)3-a=0=>a=3
Ctinamaria31xxxask
a)ecuatia ax+a+1=0 are solutia x=2
2a+a+1=0
3a=-1
a=-1/3

b)ecuatia 3x-a+2=0 are solutia x=1supra 3

3*1/3-a+2=0
3/3-a+2=0
1-a+2=0
3-a=0
-a=-3 /*-1
a=3