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Stupid simplification question

  1. Oct 19, 2011 #1

    I'm not understand this simple step.

    Btw, this isn't technically a homework question so I think it should be fine posting it here.

  2. jcsd
  3. Oct 19, 2011 #2

    Char. Limit

    User Avatar
    Gold Member

    Let [itex]u=\alpha^2[/itex] and then solve for u via the quadratic formula. It'll come out plain as day.
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