Question

Tim x

(x + 5)² = 100

Answer 1

\(\left(x+5\right)^2=100\Leftrightarrow\left[{}\begin{matrix}x+5=10\\x+5=-10\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-15\end{matrix}\right.\) vậy \(x=5;x=-15\)

Answer 2

\(\left(x+5\right)^2=100\Rightarrow\left[{}\begin{matrix}x+5=10\\x+5=-10\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=5\\x=-15\end{matrix}\right.\)

Vậy \(x=5\) hoặc \(x=-15\)

Answer 3

(x + 5)\(^2\) = 100

(x + 5)\(^2\) =10\(^2\)

\(\Rightarrow\)x+5=10

x=10-5

x=5