Question

Answer 1

Bài 1: 

a: \(\Leftrightarrow\left(x-1\right)^2=0\)

=>x=1

Answer 2

Bài 2:
\(1,\\ a,x^2-2x+1=0\\ \Rightarrow\left(x-1\right)^2=0\\ \Rightarrow x-1=0\\ \Rightarrow x=1\\ b,2x\left(x+3\right)-4\left(x+3\right)=0\\ \Rightarrow\left(2x-4\right)\left(x+3\right)=0\\ \Rightarrow\left[{}\begin{matrix}2x-4=0\\x+3=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)