Question

I am having a hard time solving my problem

2ã20 + 5 ã 80 - 7 ã5

Can someone please help me
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

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