Question

(x+y+2z)(x²+y²+z²-2xy-2yz-2zx)​

Answer 1

Answer:

Step-by-step explanation:x + y + z)²

Compare this with (a + b)², whereas { a = x and b = (y + z) }

As we know (a + b)² = a² + b² + 2ab

On Applying formula, we get

(x + y + z)²

=> x² + (y + z)² + 2x(y + z)

=> x² + y² + z² + 2yz + 2xy + 2xz

Hence, proved.