Question

I need help completing this problem ASAP

Answer 1

`4√(5)`

Explanation:

Prime factorize 20 and 45

`√(20)=√(2*2*5)=2√(5)\\\\\\√(45)= √(5*3*3)=3√(5)`

`√(20)-√(5)+√(45)=2√(5)-√(5)+3√(5)`

`=(2-1+3)√(5)\\\\\\= 4√(5)\\`