ax^2+bx+c=a(x-x1)(x-x2)=>
2x^2-7x+3=0
D=49-48=25
x1=2
x2=12
=>2(x-2)(x-12)=(2x-4)(x-12)
6x^2-5x-6=0
D=25+144=169
x1=-24
x2=54
=>6(x+24)(x-54)=(6x+144)(x-54)