algebra
posted by Teena .
I am having a hard time solving my problem
2ã20 + 5 ã 80  7 ã5
Can someone please help me

algebra 
Reiny
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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