Respuesta :
[tex]x^2-20x+36=0\\\\x^2-2x-18x+36=0\\\\x(x-2)-18(x-2)=0\\\\(x-2)(x-18)=0\iff x-2=0\ or\ x-18=0\\\\\boxed{x=2\ or\ x=18}[/tex]
[tex]x^2 - 20x + 36 = 0 \\
x^2-2x-18x+36=0\\
x(x-2)-18(x-2)=0\\
(x-18)(x-2)=0\\
x=18 \vee x=2
[/tex]