Question

phân tích thành nhân tử

x² - y² + 6x + 9

Answer 1

(x²+6x+9) - y²= (x+3)²-y²= (x+3-y) (x+3+y)

Answer 2

(x²+6x+9) - y²

= (x+3)²-y²

= (x+3-y) (x+3+y)

Answer 3

(x2+6x+9) - y2= (x+3)2-y2
= (x+3-y) (x+3+y)

Answer 4

(x²+6x+9) - y²

= (x+3)²-y²

= (x+3-y) (x+3+y)