Question

factorise 1-x^2+2xy-y^2​

Answer 1

Answer:

Step-by-step explanation:

1-x²+2xy-y²

-(1+x²-2xy+y²)

x²-2xy+y²-1

(x²-2xy+y²)-1

(x-y)²-(1)²

(x-y+1)(x-y-1)