a) (2010 - x)(x + 2021) = 0
<=> \(\left[{}\begin{matrix}2010-x=0\\x+2021=0\end{matrix}\right.\)<=> \(\left[{}\begin{matrix}x=2010\\x=-2021\end{matrix}\right.\)
b) (x - 2)^2 + 5(x - 2) = 0
<=> x^2 - 4x + 4 + 5x - 10 = 0
<=> x^2 + x - 6 = 0
<=> x^2 - 2x + 3x - 6 = 0
<=> x(x - 2) + 3(x - 2) = 0
<=> (x + 3)(x - 2) = 0
<=> \(\left[{}\begin{matrix}x+3=0\\x-2=0\end{matrix}\right.\) <=> \(\left[{}\begin{matrix}x=-3\\x=2\end{matrix}\right.\)
anh ơi, xoay ngược ảnh lại đi Anh
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