Simplify:
`sqrt(3)a + sqrt(9)b + sqrt(6)`

Simplify 6sqrt(3)+ 5sqrt(12)

Simplify : 3sqrt(-16)-2sqrt(-9)+4sqrt(-36)

Simplify (sqrt(3)+2)(sqrt(3)-2)

Simplify: (7sqrt(3))/(sqrt(10)+sqrt(3))-(2sqrt(5))/(sqrt(6)+sqrt(5))-(3sqrt(2))/(sqrt(15)+3sqrt(2))

Simplify sqrt(a sqrt(a sqrt(a sqrt(a)))) for a=3^((16)/(15))

Simplify: (i) (2 sqrt(2) + 3 sqrt(3)) (2 sqrt(2) - 3 sqrt(3)) (ii) (2 sqrt(8) - 3 sqrt(2))^(2) (iii) (sqrt(7) + sqrt(6))^(2) (iv) (6 - sqrt(2))(2 + sqrt(3))

Simplify: sqrt(8/9)-3sqrt(1/2)+5sqrt(9/8)