2x2 + (-5x) + 3 = 0
2x2 - 2x - 3x + 3 = 0
2x.(x-1) - 3.(x-1) = 0
(x-1).(2x-3)=0
...
bn tự lm tiếp nha
\(2x^2+\left(-5x\right)+3=0\)
\(2x^2-5x+3=0\)
\(2x^2-2x-3x+3=0\)
\(\left(2x^2-2x\right)-\left(3x-3\right)=0\)
\(2x\left(x-1\right)-3\left(x-1\right)=0\)
\(\left(x-1\right)\left(2x-3\right)=0\)
Hoac \(x-1=0\Rightarrow x=1\)
Hoac \(2x-3=0\Rightarrow2x=3\Rightarrow x=\frac{3}{2}\)