Question

Giúp mình vs ạ

Answer 1

a. 2x²(x - 3) - 2x(3 - x) = 0

<=> 2x²(x - 3) + 2x(x - 3) = 0

<=> (2x² + 2x)(x - 3) = 0

<=> 2x(x + 1)(x - 3) = 0

<=> \(\left[{}\begin{matrix}2x=0\\x+1=0\\x-3=0\end{matrix}\right.\)

<=> \(\left[{}\begin{matrix}x=0\\x=-1\\x=3\end{matrix}\right.\)

b. 4x(x - 2) - x + 2 = 0

<=> 4x(x - 2) - (x - 2) = 0

<=> (4x - 1)(x - 2) = 0

<=> \(\left[{}\begin{matrix}4x-1=0\\x-2=0\end{matrix}\right.\)

<=> \(\left[{}\begin{matrix}x=\dfrac{1}{4}\\x=2\end{matrix}\right.\)