\\
- -1 \ \ \ \ - \ \ 2 + \\\\
2^x=2\\
x=1\\
\ [1;+oo)
" alt="4^x-2^x+1 \geq 3\\
2^x=a\\
a^2-a+1 \geq 3\\
a^2-a-2 \geq 0\\
D=1+4*1*2 = 3^2\\
a=2\\
a=-1\\\\
------>\\
- -1 \ \ \ \ - \ \ 2 + \\\\
2^x=2\\
x=1\\
\ [1;+oo)
" align="absmiddle" class="latex-formula">