(5b - 2)(5b + 2) + (4b - 2)² = (5b)² - 2² + (4b)² -2×4b×2 + 2² = 25b² + 16b² - 16b = 41b² - 16b = 41 × 3² - 16 × 3 = 369 - 48 = 321
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(5b - 2)(5b + 2) + (4b - 2)² = (5b)² - 2² + (4b)² -2×4b×2 + 2² = 25b² + 16b² - 16b = 41b² - 16b = 41 × 3² - 16 × 3 = 369 - 48 = 321