Short Answer

Database Query Optimization

A data architect is optimizing a system query that calculates the variance between two performance metrics, xx and yy. The original query formula contains the complex rational expression 1x21y21x+1y\frac{\frac{1}{x^2}-\frac{1}{y^2}}{\frac{1}{x}+\frac{1}{y}}. To reduce computational load, the architect must simplify this expression using the least common denominator (LCD) method. Based on the standard steps for simplifying this specific expression, what is the final simplified form, and what is the common binomial factor that gets canceled out just before reaching that final form?

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Updated 2026-05-25

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