Question

determinati a∈R pentru care enunturile de mai jos devin propozitii adevarate:
a)ecuatia 2x+a=0 are solutia-5
b)ecuatia -ax+12=0 are solutia 1
c)ecuatia ax+a=0 are solutia 2

Answer 1

a)2·(-5)+a=0
-10+a=0/+10
a=10
b)-1a+12=0/-12
-1a=-12/:(-1)
a=12
c)2a+a=0
3a=o/:3
a=o