Multiple Choice

In a precision manufacturing workshop, a technician is required to simplify the expression (4+57)(4−57)({}4 + 5\sqrt{7})({}4 - 5\sqrt{7}) to calculate a material's tolerance level. According to the product of conjugates pattern, (a+b)(a−b)=a2−b2(a + b)(a - b) = a^2 - b^2, which of the following represents the correct initial setup for this simplification?

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Updated 2026-09-18

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