a) 2019 . x . ( x² - 100 ) = 0
\(\left[ \begin{array}{l}2019x=0\\x² - 100=0\end{array} \right.\) (=)\(\left[ \begin{array}{l}x=0\\x² = 100\end{array} \right.\) (=)\(\left[ \begin{array}{l}x=0\\x=±10\end{array} \right.\)
b) 2017 . (3x - 6) . (2 . x^2 - 8) = 0
(3x - 6) . (2 . x² - 8)=0:2017
(3x - 6) . (2 . x²- 8)=0
\(\left[ \begin{array}{l}3x-6=0\\2x²-8=0\end{array} \right.\) (=)\(\left[ \begin{array}{l}3x=6\\2x²=8\end{array} \right.\) (=)\(\left[ \begin{array}{l}x=2\\x²=8:2\end{array} \right.\) (=)\(\left[ \begin{array}{l}x=2\\x²=4\end{array} \right.\) (=)\(\left[ \begin{array}{l}x=2\\x=±2\end{array} \right.\)
