Verified answer

√20 + 2√18

(√4 x √5) + 2(√9 x √2)

2√5 + 2(3√2)

2√5 + 6√2

can't simplify further

Can't solve, can simplify:

√(20)+2√(18) = √(2)x √(2)x√(5)+2x(√(3)x√(3)x√(2)) =2x√(5)+6x√(2)

√(20) = √(2)x √(2)x√(5) as 20 = 2x2x5 etc.

6 sqrt(2)+2 sqrt(5)