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algebra

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I am having a hard time solving my problem

2ã20 + 5 ã 80 - 7 ã5

Can someone please help me

  • algebra -

    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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