Question

sa se rezolve ecuatia |x-4|=5 si |2x-7|= x-5

Answer 1

|x-4|=5
daca x>4 ,atunci
 x-4=5
x=9
daca x<4 , atunci 
4-x=5
x= ∅
S={9}

|2x-7|= x-5
daca 2x>7, atunci
2x-7=x-5
x=2

daca 2x<7, atunci
7-2x=x-5
-3x=2
x=-2/3
S={-2/3 ; 2 }