Question

factorise 9 - x^2 +2xy-y^2 =????

Answer 1

9-(x²-2xy+y²)
9-(x-y)²
3²-(x-y)²
this is in the form a²-b²
so the factors are (3+x-y) (3-x+y)

Answer 2

Step-by-step explanation:

9-(x²-2xy+y²)

9-(x-y)²

3²-(x-y)²

this is in the form a²-b²

so the factors are (3+x-y) (3-x+y)