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= 20 + 4√3 + 5√2 + √6
2) (√3 + 1)(√3 - 2)
= 3 - 2√3 + √3 - 2
= 1 - √3
3) (√5 + √3)(√5 - √3)
= (√5)² - (√3)²
= 5 - 3
= 2
2. (√3+1) (√3-√2)= (3-√6+√3-√2)
3. (√5+√3) (√5-√3)= (5-√15+√15-3)= 5-3 =2