Question

Ma puteti ajuta cu aceasta problema 4 la puterea x + 2 la puterea x+1=80.

Answer 1

$4^{x}+ 2^{x+1} =80,2^x=t,t\ \textgreater \ 0 \\ t^{2}+2t-80=0 \\ t=-10;t=8 \\ revenim \\ 2^x=8 \\ x=3$
S={3}