Question

(X + y + 3z) hole square

Answer 1

Hi ,

( x + y + 3z )²

= x² + y² + ( 3z )² + 2xy + 2y×3z + 2×3z ×x

= x² + y² + 9z² + 2xy + 6yz + 6zx

I hope this helps you.

: )

Answer 2

We know that
$(a + b + c) ^{2} = a ^{2} + b ^{2} + c ^{2} + 2ab + 2bc + 2ca.$
I hope my answer help you.
Plzz make me brainliest.