Question

E(x,u)= $x^{2} -2xy+y^{2} , x,y$∈Z , calculati E(2,-5)

Answer 1

$E(x,y)=x^2-2xy+y^2=(x-y)^2 \\ E(2,-5)=(2-(-5))^2=(2+5)^2=7^2=49$

Answer 2

E(x,y)=(x-y)²
E(2,-5)=(2-(-5))²=
E(2,-5)=(2+5)²
E(2,-5)=7²
E=(2,-5)=49