I am having a hard time solving my problem

Question

2�ã20 + 5 �ã 80 - 7 �ã5

Can someone please help me

Answer 1

I am going to assume you meant
2�√20 + 5√80 - 7√5

= 2*√4*√5 + 5*√16*√5 - 7*√5
= 4√5 + 20√5 - 7√5
= 17√5