Question

(x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2zx​

Answer 1

Answer:

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Answer 2

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

Hence, ~~ LHS = RHS