Question

81-x^2+2xy-y^2 for factor?
can you please help me.

Answer 1

\[(-x+y+9) (x-y+9)\]

Answer 2

\[\Large 81-x^2+2xy-y^2\]


\[\Large 81-(x^2-2xy+y^2)\]


\[\Large 81-(x-y)^2\]


\[\Large (9-(x-y))(9+(x-y))\]


\[\Large (9-x+y)(9+x-y)\]

Answer 3

that's good one too