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b. 2√6 (√8-4√5) = 2√48 - 8√30 = 2√16x√3 - 8√30
=8√3-8√30
c. (√2-√5) (√3-√6) = √6 - √12 - √15 +√30
d. (√7+√) (√4-√3)
e. (√10+√6)
f. (6√3-7)² = (6√3 - 7)(6√3-7) = 36√9 - 42√3-42√3 +49
= 108 - 84√3 + 49