a, \(2x^2+5x+3=0\Leftrightarrow (2x+3)(x+1)=0 \Leftrightarrow\left[\begin{array}{} x=-\dfrac{3}{2}\\x=-1 \end{array} \right.\)
b, \((x-3)^2=4\Leftrightarrow (x-3)^2-2^2=0\Leftrightarrow (x-5)(x-1)=0 \Leftrightarrow\left[\begin{array}{} x=5\\x=1 \end{array} \right.\)
a: =>(x+1)(2x+3)=0
=>x=-3/2 hoặc x=-1
b: =>x-3=2 hoặc x-3=-2
=>x=1 hoặc x=5