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b) (√3 + √2)(√5 - √3) = √15 - 3 + √10 - √66
c) (√7 + √2)(√7 - √2) = 7 - 2 = 5
d) (√7 + √2) = (√7)² + 2√7 .√2 + (√2)²
= 7 + 2√14 + 2
= 9 + 2√14