Question

giúp mình với ạ

 

Answer 1

\(\Rightarrow\left(2x+7\right)^2=36\)

\(\Rightarrow\left[{}\begin{matrix}2x+7=6\\2x+7=-6\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}2x=-1\\2x=-13\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=-\dfrac{13}{2}\end{matrix}\right.\)