Răspuns:
[tex]x^{2}[/tex]-7x+12=0 => a=1, b= -7, c= 12
=> delta = [tex]b^{2}[/tex]-4*(a*c) => delta = 49-48 => delta = 1
=>
[tex]x_{1}[/tex]= (-b + [tex]\sqrt{delta\\}[/tex]) /2*a =>
[tex]x_{2}[/tex]= (-b - [tex]\sqrt{delta\\}[/tex]) / 2*a =>
[tex]x^{2}[/tex]-7x+12= (x-4)(x-3)
