Question

Answer 1

 

khó nhìn wa ặ

Answer 2

\(a,\Leftrightarrow x\left(x^2-6x+9\right)=0\\ \Leftrightarrow x\left(x-3\right)^2=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\end{matrix}\right.\\ b,\Leftrightarrow x^2+3x-10-x^2-x=0\\ \Leftrightarrow2x=10\Leftrightarrow x=5\\ c,\Leftrightarrow x^2-x-42=0\\ \Leftrightarrow x^2-7x+6x-42=0\\ \Leftrightarrow\left(x-7\right)\left(x+6\right)=0\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-6\end{matrix}\right.\)