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= 5√2 - 2√5
b) 2√3 (2√3 (2√(4 x 10) + √(4 x 3))
= 2√3 (2√3 (4√10 + 2√3))
= 2√3 (8√30 + 12)
= 16√(9 x 10) + 2√36
= 48√10 + 12
c) (√2 + √5)(√2 - √5) = 2 - 5
= - 3