Answer:
9 units added
Step-by-step explanation:
[tex]f(x)=x^2-6x+1[/tex]
In competing the square method , we take the half of the square of the coefficient of middle term
6x is the middle term.
[tex]\frac{6}{2} =3[/tex]
[tex]3^2=9[/tex]
To complete the square , add and subtract 9
[tex]f(x)=x^2-6x+9-9+1[/tex]
[tex]f(x)=(x^2-6x+9)-9+1[/tex]
[tex]f(x)= (x+3)(x+3)-8[/tex]
[tex]f(x)= (x+3)^2-8[/tex]
So 9 unit tiles is added to the function to complete the square
