Question

(a-y+c)(a+y-c) in suitable property ​

Answer 1

(a-y+c) (a+y-c)

= -1(a+y -c)(a+y-c)

= -1(a+y -c)²

= -( a²+y²+c²+2ay-2yc-2ya)

= -a²-y²-c²-2ay+2yc+2ya