(b - 2)(b + 2) - (b - 1)² = b² - 4 - (b² - 2b + 1) = b² - 4 - b² + 2b - 1 = 2b - 5
b = 11
2 * 11 - 5 = 22 - 5 = 17
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(b - 2)(b + 2) - (b - 1)² = b² - 4 - (b² - 2b + 1) = b² - 4 - b² + 2b - 1 = 2b - 5
b = 11
2 * 11 - 5 = 22 - 5 = 17