Question

3x-3= 2x-7

(2x+3)(3x-9)=0

(5x+2)(4x-6)=0

Answer 1

a/ \(3x-3=2x-7\)

\(\Leftrightarrow3x-2x=-7+3\)

\(\Leftrightarrow x=-4\)

b/ \(\left(2x+3\right)\left(3x-9\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}2x+3=0\\3x-9=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{3}{2}\\x=2\end{matrix}\right.\)

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c/ \(\left(5x+2\right)\left(4x-6\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}5x+2=0\\4x-6=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{2}{5}\\y=\dfrac{3}{2}\end{matrix}\right.\)

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