Can you check my answers?
1. 3√20/√4
= 3√(5)(4)/2
= 3(2)√5/2
= 3√5
2. 4√15/√9
= 4√15/3
3. √12/√16
= √4(3)/4
= 2√3/4
= √3/2
4. √10/√5
= √2
5. √15/√20
= √(5)(3)/√5(4)
= √3/2
6. 4√10/√32
= 4√2(5)/√16(2)
= 4√5/4
= √5
7. -3√5 - 3√45 + 2√12
= -3√5 - 3√9(5) + 2√4(3)
= -3√5 - 3(3)√5 + 2(2)√3
= -3√5 - 9√5 + 4√3
= -12√5 + 4√3
8. 2√12 - 3√3 - 2√24
= 2√4(3) - 3√3 - 2√4(6)
= 2(2)√3 - 3√3 - 2(2)√6
= 4√3 - 3√3 - 4√6
= √3 - 4√6
9. 3√2 - √54 + 2√2
= 3√2 - √9(6) + 2√2
= 3√2 - 3√6 + 2√2
= 5√2 - 3√6
10. √15(√3 + 3)
= √45 + 3√15
= √9(5) + 3√15
= 3√5 + 3√15
11.√6(√3 + 2)
= √18 + 2√6
= √9(2) + 2√6
= 3√2 + 2√6