Question

factorise using identiity
x-y-x²+y²

please give a step by step solution
so that I can prepare for exam
like ateacher​

Answer 1

Answer:

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

Step-by-step explanation:

x-y-x²+y²

= x-y- (x²- y²)

= (x-y) - (x+y)(x-y)     [ using the identity, a²-b² = (a+b)(a-b) ]

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

= (x-y) (1-x-y)