3x-3=0 x=1
2^x-10=0 x=log[2]10∈(3,4)
Faci tabelul de sene
x l-∞...............................0........1...............3 . log[2]10]............+∞
_____________________________________________
3x-3 l - - - - - - - - - 0+ + + + + +
______________________________________________
2^x-10l- - - - - - - - - - - - -0+ + + +
______________________________________________
f(x) l+ + + + + + + + 0_ _ _ _ 0+ + + + +
Iei in considerare intervalul pe care f este negativa, adica x∈(1,log[2]10
