Question

Factor the expression below x^2-6x+9

Answer 1

x^2-6x+9  

x^2-3x-3x+9

x(x-3)-3(x-3)

(x-3)(x-3)

(x-3)^2

Answer 2

the answer to your question would be (x-3)². you get this answer by  using the a²-2×ab+b²=(a-b)².