Răspuns :
4 la x (4 la 2 +4 + 1) =336
4 la x ori 21 = 336
4 la x = 336/21
4 la x = 112/7
4 la x ori 21 = 336
4 la x = 336/21
4 la x = 112/7
4^{x+2} + 4^{x+1} + 4^{x} =336
4^{x} *( 4^{2} +4+1)=336
4^{x} *21=336
4^{x} =16
4^{x} = 4^{2}
x=2
4^{x} *( 4^{2} +4+1)=336
4^{x} *21=336
4^{x} =16
4^{x} = 4^{2}
x=2