Question

tìm x

x mũ 2 =169        

Answer 1

x^2=168

x^2=13^2

Suy ra x=13

Answer 2

x² =169

x²=13² =)x=13

Vậy x=13

~

Answer 3

x² = 169

x² = 13²

=> x = 13

Answer 4

Sai hết ròi 

\(x^2=169=\left(\pm13\right)^2\)

\(\Rightarrow\orbr{\begin{cases}x=13\\x=-13\end{cases}}\)

Vậy x = { 13; -13 }

Answer 5

\(x^2=169\)

\(\Rightarrow\orbr{\begin{cases}x^2=13^2\\x^2=\left(-13\right)^2\end{cases}\Rightarrow\orbr{\begin{cases}x=13\\x=-13\end{cases}}}\)

Vậy x=13; x=-13