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Rezolvati eucatia :
[tex] 3^{x+3}+3^{x+2} -3^{x}=315[/tex]


Răspuns :

3^x(3^3+3^2-1)=315⇔3^x*35=315⇔3^x=9⇔3^x=3^2⇒x=2
3la putereax(3la 3+3la 2-1)=315
3la x(27+9-1)=315
3 la x35=315
3 la x=9
x=2