Verified answer

Ответ:

x²-9y²+x-3y

a²-b²=(a-b)(a+b)a²-b²=(a-b)(a+b)

x²-3²y²

x²-(3y)²

a²-b²=(a-b)(a+b)a²-b²=(a-b)(a+b)

(x-3y)*(x+3y)

(x-3y)*(x+3y)+x-3y

(x-3y)*(x+3y+1)