Determine whether the polynomial is a perfect square and if it is, factor it.

n^2 - 9n + 9

N^2 - 9n + 9 is not a perfect square

to determine whether it is a perfect square or not

take the square root of the constant term 9, & multiply it by 2

the result should be 9, the constant term of n

in this case it is √9 * 2 = 6