Вопрос в картинках...

Решите задачу:

$2^{x+1}+2^{-x}-3 \ \textless \ 0\\ 2*2^x+ \frac{1}{2^x}-3 \ \textless \ 0| *2^x\ \textgreater \ 0 \\ 2*4^x-3*2^x+1\ \textless \ 0\\ y=2^x\\ 2y^2-3y+1\ \textless \ 0\\ 2y^2-3y+1=0\\ a=2 \ b=-3 \ c=1\\ D=b^2-4ac=(-3)^2-4*2*1=9-8=1\\ x_{1,2}= \frac{3б1}{2*2}= \left[\begin{array}{c}1\\ \frac{1}{2} \end{array}\right] \\ \frac{1}{2} \ \textless \ y\ \textless \ 1\\ 2^{-1}} \ \textless \ 2^x\ \textless \ 2^0\\ 2\ \textgreater \ 1 \ -\ \textgreater \ \\ -1\ \textless \ x\ \textless \ 0,$