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3√45 -2√20 +√80
= 3√(5.9) -2√(5.4) + √(5.16)
= 3.3√5 -2.2√5 + 4√5
= 9√5 - 4√5 +4√5
= 9√5
b.
(5-√3)(5+√3)
= 25 + 5√3 -5√3 -3
= 22
c.
2√3(√12-√8)
= 2√(3.3.4) - 2√(3.2.4)
=12 - 4√6
3√45-2√20+√4(pangkat 2)√5
3√45-2√20+4√5
=17.5545