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= (√3×√7)-(√3×5)
=√21 - 5√3
b) 2√6(√8-4√5)
= (2√6×√8)-(2√6×4√5)
=2√48 - 8√30
=2√16×3 - 8√30
=8√3 - 8√30
c)(√3+√6)(√2-√5)
= (√3×√2)-(√3×√5)+(√6×√2)-(√6×√5)
= √6 -√15+√12-√30
= √6 -√15+√4×3 - √30
=√6-√15+2√3-√30