Respuesta :

[tex]\text {We add } (\frac{b}{2} )^2 \text { to form a perfect trinomal. } [/tex]

[tex]x^2 - 6x + 3^2 = (x -3)^2[/tex]

[tex]3^2 = 9[/tex]

[tex]\boxed {\boxed {\text {Answer = 9}}}[/tex]

Answer: i got 9 as the answer