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March 25, 2017

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u-2√u=3. what is u?

  • Math - ,

    change u to x^2, then sqrtu = x

    x^2-2x-3=0

    (x-3)(x+1)=0

    x=3, or u= + 9

    x=-1, or u=+ 1

    checking
    u=9
    9-2*3=3 checks
    u= i
    1-2 does not equal 3, does not check.

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