4^x+ 4^×+1 +4^×+2= 336

Răspuns :

4^x+4^x+1+4^x+2=336
(1+4+4²)•4^x=336
(1+4+16)•4^x=336
21•4^x=336
4^x=16
4^x=4²
x=2
4^x+4^x*4+4^x*4^2=336
4^x(1+4+4^2)=336
4^x(1+4+16)=336
4^x*21=336
4^x=336/21
4^x=16
(2^2)^x=2^4
2x=4
x=4/2
x=2