Question

x la 2 -y la 2,daca x+y=3 si x-y=2

Answer 1

$x^{2} - y^{2} =? \\ x+y=3 \\ x-y=2 \\ (x-y)(x+y)= x^{2} - y^{2}=2*3=6$

Answer 2

Deci (x-y)(x+y)=2*3=6