\(\left(3.x^2-2^4\right)2^3=2^8\\ \left(3.x^2-2^4\right)=2^8:2^3\\ \left(3.x^2-2^4\right)=2^5\\ 3.x^2-2^4=32\\ 3.x^2=32+2^4\\ 3.x^2=48\\ x^2=48:3\\ x^2=16\\ x=+-4\)
bn ghi lại đề câu b) nhé
lx-5l-2(-3)=2^4
lx-5l+6=16
lx-5l=16-6
lx-5l=10
\(\left[{}\begin{matrix}x-5=-10\\x-5=10\end{matrix}\right.\\ =>\left[{}\begin{matrix}x=-10+5\\x=10+5\end{matrix}\right.\\ =>\left[{}\begin{matrix}x=-5\\x=15\end{matrix}\right.\)
