ban co the bao minh cach lam ko
Ta có: \(\left(x-1\right)^{x+2}=\left(x-1\right)^{x+4}\)
\(\Leftrightarrow\left(x-1\right)^x.\left(x-1\right)^2=\left(x-1\right)^x.\left(x-1\right)^4\)
\(\Leftrightarrow\left(x-1\right)^2=\left(x-1\right)^4\)
\(\Rightarrow x-1=\left\{-1;1\right\}\)
Nếu x - 1 = - 1 thì x = 0
Nếu x - 1 = 1 thì x = 2
Vậy x mang 2 giá trị là: x =2 hoặc x = 0
Bạn Duong làm thiếu nghiệm.
\(\left(x-1\right)^{x+2}=\left(x-1\right)^{x+4}\)
\(\Leftrightarrow\left(x-1\right)^{x+2}-\left(x-1\right)^{x+4}=0\)
\(\Leftrightarrow\left(x-1\right)^{x+2}\left[1-\left(x-1\right)^4\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}\left(x-1\right)^{x+2}=0\\\left(x-1\right)^4=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=1\\x-1=1;x-1=-1\end{cases}}\)
\(\Leftrightarrow x=1;x=2;x=0\)
