Question

repede va rog frumos am.nevoie​

Answer 1

b) x^2+2xy+y^2= (x+y)^2

x^2+2xy+y^2- (x+y)^2= (x+y)^2-(x+y)^2=0

c) x^2-2xy+y^2= (x-y)^2

x^2-2xy+y^2- (x-y)^2= (x-y)^2-(x-y)^2=0