Factorise x2-6x plus 9

Answer 1

x*2 - 6x + 9

x*2 -3x -3x +9

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

(x-3)(x-3)

Note also that x*2 - 6x + 9 is of the form a*2 -2ab + b*2 and so the factors are

(x-3) and (x-3)