Question

please help in following question
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Answer 1

Answer:

2

Step-by-step explanation:

your expression is equal to

${x}^{2} + {y}^{2} + {z}^{2} - yz - zx \\ = \frac{1}{2} ( { (x - y)}^{2} + { (y - z) }^{2} + {(z - x)}^{2} ) \\ = 0$

Which is only true if x = y = z

so

$\frac{x + y}{z} = \frac{x + x}{x} = 2$