Question

Determina nr nat x care verifica egalitatea 2^x+2^x+2=160

Answer 1

[tex] 2^{x}+ 2^{x+2}=160 \\ 2^{x}+ 2^{x}* 2^{2}=160 [/tex]
Notăm $2^{x}=t\ \textgreater \ 0$
Obținem:
t+4t=160
5t=160
t=160:5
t=32
[tex] 2^{x}=32 \\ x=5 [/tex]