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math..solve for u again.

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u-2√2=3. please show work

  • math..solve for u again. - ,

    What part of my work don't you understand?

    u - √2 = 3

    u - 1.414 = 3

    u = 4.414

  • math..solve for u again. - ,

    the answer should be 9

  • math..solve for u again. - ,

    sorry. u-2√u=3

  • yes, 9 is right - ,

    let x = sqrt u
    then
    x^2 - 2 x = 3
    x^2 - 2 x - 3 = -
    (x-3)(x+1) = 0
    x = 3 or x = -1
    try sqrt u = 3 then u = 9
    9 - 6 = 3 Yes
    try sqrt u = -3 , that is an imaginary number, forget it
    so
    u = 9

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