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algebra

posted by on .

sqrt(45)+ sqrt(20)+ sqrt(5)-sqrt(125)=??
I came up with 6sqrt5 I know it's wrong. I think I messed up the breakdown of the sqrt of 125

  • algebra - ,

    sqrt(125) = sqrt (5*25) = 5 sqrt(5)

  • algebra - ,

    sqrt(9*5) + sqrt(4*5) + sqrt5 - sqrt(25*5)
    = (3 +2 +1 -5)sqrt5 = sqrt5

  • algebra - ,

    So is the answer 6sqrt(5)?? Thank you

  • algebra - ,

    sqrt (9*5)+sqrt(4*5)+sqrt(5) -5 sqrt(5)

    3 sqrt(5) +2 sqrt (5) + 1 sqrt(5) - 5 sqrt (5)

    that is
    1 sqrt(5)

  • algebra - ,

    ohhh I see what I did wrong Thanks you 2

  • algebra - ,

    No, it is NOT 6 sqrt(5)

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