Question

Scrieti multimea solutiilor ecuatiei:

b)2x+3=2(x+1)
 
c)3(x+1)=3(x+2)-3

Answer 1

b) 2x+3=2(x+1)
2x+3=2x+2
2x-2x=2-3
x=1
c)3(x+1)=3(x+2)-3
3x+3=3x+6-3
3x-3x+6-3-3
x=0

Answer 2

Dupa efectuarea operatiilor,avem:
b). 2x+3=2x+2  =>  2x-2x=2-3 deci 0=-1 (fals) ... este o ecuatie ne definita !
c). 3x+3=3x+6-3  =>  3x-3x=+6-3-3 ... ecuatie ne definita !