Question

factorise l-2ab-a²-b²

Answer 1

Solution is in the attachment..

Answer 2

Answer: (1 + a +b).(1 - a - b)

Step-by-step explanation:

1 - 2ab - (a 2 + b 2 )

= 1 -2ab -a2- b2

= 1 - (2ab +a2 +b2)

= 1- (a+b)2

= (1 + a +b).(1 - a - b)