Question

factorise by using identitii :
( a + b ) square - ( x - y ) square

Answer 1

(a+b)^2- (x-y)^2 Let (a+b) be A and (x-y) be B So A^2-B^2=(A+B)(A-B) Hence- (a+b+x+y)(a+b-x+y) is the answer