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math

posted by on .

simplify:

2sqrt50 - sqrt8

I am confused because of the 2 before the sqrt50

  • math - ,

    2 sqrt 50 = 2 sqrt (5*5*2) = 10 sqrt 2
    sqrt 8 - sqrt (2*2*2) = 2 sqrt 2

    10 sqrt 2 - 2 sqrt 2 =

  • math - ,

    is 8sqrt2 correct?

  • math - ,

    The 2 before the sqrt50 just means 2 times sqrt50
    Since
    sqrt50=5sqrt2
    and
    sqrt8=2sqrt2
    2*5sqrt2-2sqrt2
    =10sqrt2-2sqrt2
    =8sqrt2

  • math - ,

    Yes, both right :)

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