Question

(5+x) mũ 2-36=0

Answer 1

\(\left(5+x\right)^2-36=0\\ \Rightarrow\left(5+x\right)^2=36\\ \Rightarrow\left[{}\begin{matrix}5+x=6\\5+x=-6\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=1\\x=-11\end{matrix}\right.\)

Answer 2

x=1

Answer 3

\(x\in\left\{1;-11\right\}\)

Answer 4

(5+x)²=0+36

(5+x)²=36

 

Answer 5

\(\left(5+x\right)^2-36=0\)

\(\Rightarrow\left(5+x\right)^2-6^2=0\)

\(\Rightarrow\left\{{}\begin{matrix}5+x+6=0\\5+x-6=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}11+x=0\\-1+x=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=-11\\x=1\end{matrix}\right.\)

P/s:Lớp 6 đã học hđt???