Question

2x(x – 3) + 5(x – 3) = 0

Answer 1

2x(x-3)+5(x-3)=0

=>(2x+5)(x-3)=0

=>2x+5=0 hoặc x-3=0

=>x=-5/2 hoặc x=3

Answer 2

\(2x\left(x-3\right)+5\left(x-3\right)=0\)

\(\Leftrightarrow\left(x-3\right)\left(2x+5\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x-3=0\\2x+5=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=\frac{-5}{2}\end{matrix}\right.\)

Answer 3

2x(x - 3) + 5(x - 3) = 0

=> ( 2x + 5) .(x - 3) = 0

=> 2x +5 = 0 hoặc x - 3 = 0

2x = -5 x = 0 + 3

x = -5 : 2 x =3

x = \(\frac{-5}{2}\)

Vậy x = \(\frac{-5}{2}\) hoặc x = 3