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Quick algebra question

  1. Jul 23, 2012 #1
    vq154z.png

    Could anyone explain how they made the jump from the highlighted parts? i.e how do you go from

    2a(q-t) + at(q-t)(q+t) = 0 to
    a(q-t)(2+t(q+t)) = 0

    in one step
     
  2. jcsd
  3. Jul 23, 2012 #2
    If you pull out a(q-t) from both terms of the summation in the first equation, what do you have left?
     
  4. Jul 23, 2012 #3
    thanks
     
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