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=> √8 x √3 ( 2 - 3√4)
=> 2√6 ( 2 - 6)
=> -8√6
b. (5 + 2√3)(5 - 2√3)
=> 25 - 10√3 + 10√3 - 12
=> 25 - 12 = 13
c. √8 + √3
=> 2√2 + √3