Multiple Choice

A quality control technician is inspecting a CAD drawing for a square metal plate where the surface area is defined by the formula $4a^2 - 12ab + 9b^2.Toverifythatthisformulacanbesimplifiedtotheform. To verify that this formula can be simplified to the form (x - y)^2, the technician must confirm that the middle term ($12ab) matches the $2xy$ requirement of the perfect square pattern. Which calculation correctly demonstrates this specific verification step?

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Updated 2026-04-20

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