Question

tìm x:

x² = 16

Answer 1

x\(^2\) = 16

x\(^2\)=4\(^2\)

Suy ra x=4.

Answer 2

\(x^2=16\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2=8^2\\x^2=\left(-8^2\right)\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=8\\x=-8\end{matrix}\right.\)

Vậy ...

Answer 3

x² = 16

=> x² = ( \(\pm\)4 )²

=> x = 4 hoặc x = - 4

Answer 4

Tìm x:

\(x^2\)=16

\(x^2\)=\(4^2\)

\(\Rightarrow\)x=4