(a - b)² = a² - 2ab + b²
(7n - 8)² - n² = 49n² - 112n + 64 - n² = 48n² - 112n + 64.
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(a - b)² = a² - 2ab + b²
(7n - 8)² - n² = 49n² - 112n + 64 - n² = 48n² - 112n + 64.