Răspuns :
5-2x>0=> x<5/2
Prelucrezi ecuatia
5-2x=3²
2x=5-9=-4
x=-2 , -2 <5/2, solutie acceptata
Prelucrezi ecuatia
5-2x=3²
2x=5-9=-4
x=-2 , -2 <5/2, solutie acceptata
Existenta:
3(5-2x)>0
2x-5<0
2x<5
x<5/2
x∈{-∞,5/2)
Rezolvam ecuatia:
log3(5-2x)=2
5-2x=3^2
5-2x=9
2x=5-9
2x=-4
x=-4/2
x=-2
Ceea ce adevarat
-2<5/2
3(5-2x)>0
2x-5<0
2x<5
x<5/2
x∈{-∞,5/2)
Rezolvam ecuatia:
log3(5-2x)=2
5-2x=3^2
5-2x=9
2x=5-9
2x=-4
x=-4/2
x=-2
Ceea ce adevarat
-2<5/2