288:(x-3)2=2
=> (x-3)2=144
=>x-3=12(vì x thuộc N)
=> x=15
\(8.6+288:\left(x-3\right)^2=50\)
\(\Rightarrow48+288:\left(x-3\right)^2=50\)
\(\Rightarrow288:\left(x-3\right)^2=50-48=2\)
\(\Rightarrow\left(x-3\right)^2=288:2=144\)
Mà \(\left(x-3\right)^2=144=12^2\)
\(\Rightarrow x-3=12\)
\(\Rightarrow x=12+3\)
\(\Rightarrow x=15\)
8.6+288:(x-3)2=50
48+288:(x-3)2=50
288:(x-3)2=50-48
288:(x-3)2=2
(x-3)2=288:2
(x-3)2=144
=>(x-3)2=122=(-12)2
=>\(\orbr{\begin{cases}x-3=12\\x-3=-12\end{cases}}\)
=>\(\hept{\orbr{\begin{cases}x=15\\x=\left(-9\right)\end{cases}}}\)
