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b) √5² - 2 × √5 × 3 + 3² = √25 - 6√5 + 9 = 5 - 6√5 + 9 = 14 - 6√5
c) 6² - 2 × 6 × √3 + √3² = 36 - 12√3 + √9 = 36 - 12√3 + 3 = 39 - 12√3
d) 1² + 2 × 1 × 2√2 + 2√2² = 1 + 4√2 + 4 × 2 = 1 + 4√2 + 8 = 9 + 4√2