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) 2x+a=0 are ca solutie -5 <=> 2*(-5) +a =0 => -10+a=0 => a=10. 
b) -ax+12=0 are ca solutie 1 <=> -a+12=0 => a=12
c) ax+a=0 are ca solutie 2 <=> 2a+a=0 => 3a=0 => a=0