Question

(x-y+6)(x+y-6)

Answer 1

hằng đẳng thức thứ 3 nha bn

Answer 2

thank you ban nha

Answer 3

(x-y+6).(x+y-6)

= x² + xy - 6x - yx - y² + 6y + 6x + 6y - 36

= (xy-yx) + (6x-6x+ 6x) + (6y+6y) +x² -y² - 36

= 6x + 12y + x² -y² - 36

Answer 4

\(\left(x-y+6\right)\left(x+y-6\right)\)

\(=x^2+xy-6x-yx-y^2+6y+6x+6y-36\)

\(=x^2-y^2+12y-36\)