How many more unit tiles must be added to the function f (x) = x^2-6x+1 in order to complete the square?

1

6

8

9

f (x) = x^2 - 6x + 1

In order to Complete the square

F (x) can be rewritten as

x^2 - 2 * 3x + 1

Now As coefficient of x^2 is 1 and coefficient of x is 3

We need 3^2 = 9 as constant term

As Constant term = 1

So we need to add 8 to make it perfect square

Finally, 8 more unit Tiles must be added to function in order to complete the square