Question

xy + yz +zx whole Square

Answer 1

Solution :

***************************†************
We know the algebraic identity:

(a+b+c)² = a²+b²+c²+2ab+2bc+2ca

****************************************

Here ,

(xy+yz+zx)²

= (xy)²+(yz)²+(zx)²+2(xy)(yz)

+2(yz)(zx)+2(zx)(xy)

= x²y²+y²z²+z²x²+2xy²z+2xyz²+2x²yz

••••••