Multiple Choice

A quality control technician is verifying that the polynomial 81y272y+1681y^2 - 72y + 16 represents a perfect square area. The technician has correctly identified the square roots of the first and last terms as a=9ya = 9y and b=4b = 4. According to the perfect square trinomial pattern a22ab+b2a^2 - 2ab + b^2, which calculation must the technician perform to confirm that the middle term matches the pattern?

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Updated 2026-04-20

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