=>(2x-7)2=9
=>2x-7 =3 hoặc 2x-7=-3
=>2x=10 hoặc 2x=4
=>x=5 hoặc x=2
Vậy ....................
\(2\cdot\left(2x-7\right)^2=18\)
\(\Rightarrow\left(2x-7\right)^2=9\)
\(\Rightarrow\hept{\begin{cases}2x-7=3\\2x-7=-3\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}2x=10\\2x=4\end{cases}\Rightarrow}\hept{\begin{cases}x=5\\x=2\end{cases}}\)
2( 2x - 7)2 = 18
( 2x-7 )2 = 18 : 2
( 2x-7 )2 = 9
( 2x - 7)2 = 32
=> \(\orbr{\begin{cases}2x-7=3\\2x-7=-3\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}2x=3+7\\2x=-3+7\end{cases}}\Rightarrow\orbr{\begin{cases}2x=10\\2x=4\end{cases}}\Rightarrow\orbr{\begin{cases}x=5\\x=2\end{cases}}\)
Vậy x = ...
\(2\cdot(2x-7)^2=18\)
\(\Rightarrow(2x-7)^2=18\div2\)
\(\Rightarrow(2x-7)^2=9\)
\(\Rightarrow(2x-7)^2=3^2\)
\(\Rightarrow(2x-7)=\pm3\)
\(\Rightarrow\hept{\begin{cases}2x-7=3\\2x-7=-3\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=5\\x=2\end{cases}}\)
Vậy : ...
2(2x-7)2=18
(2x-7)2=18:2
(2x-7)2=9
=> (2x-7)2=32
2x-7=3
2x=3+7
2x=10
x=10:2
Vậy x=5
Sory còn 1 trường hợp nữa là 2x-7=-3
2x=-3+7
2x=4
x=4:2
Vậy x=2
