Question

(X-1)(x.x+1)=0

Answer 1

\(\left(x-1\right)\left(x.x+1\right)=0\)

\(\Rightarrow\left(x-1\right)\left(x^2+1\right)=0\)

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

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

\(\Rightarrow x=1\)

Answer 2

\(\left(x-1\right)\left(x.x+1\right)=0\\ < =>\left(x-1\right)\left(x^2+1\right)=0\\ =>\left[\begin{matrix}x-1=0\\x^2+1=0\end{matrix}\right.\\ =>\left[\begin{matrix}x=1\left(nhận\right)\\x^2=-1\left(loại\right)\end{matrix}\right.\\ =>x=1\)