Question

complete the following identities (I) (X+y+z)²​

Answer 1

$= {x + y + z}^{2} \\ = {x}^{2} + {y}^{2} + {z}^{2} + 2xy + 2yz + 2zx$

Answer 2

hello mate,

${(x + y + z) }^{2} \\ = {x}^{2} + {y}^{2} + {z}^{2} + 2xy + 2yz + 2zx$

hope it will help you