Short Answer

Calculating Cross-Sectional Area for Ventilation Ducts

An HVAC technician is resizing a square ventilation duct that originally had a side length of x inches. The new rectangular dimensions are (x8)(x - 8) inches by (x+8)(x + 8) inches. Using the Product of Conjugates pattern, what is the simplified expression for the cross-sectional area of the new duct?

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Updated 2026-04-17

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