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Embarassed to ask this but 0 = x2 – 15x + 50 ?

  1. Nov 19, 2007 #1
    [SOLVED] embarassed to ask this...but 0 = x2 – 15x + 50 ??

    1. The problem statement, all variables and given/known data

    0 = x2 – 15x + 50

    2. Relevant equations



    3. The attempt at a solution

    line1 0 = x2 – 15x + 50
    line2 0 = (x – 5)(x – 10)

    question: how does the equation in line one work out to the equation in the second line?
    reviewing my algebra...i can't believe how much high school math I forgot...
     
  2. jcsd
  3. Nov 19, 2007 #2

    EnumaElish

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    x(x - 10) - 5(x - 10)
     
  4. Nov 19, 2007 #3

    DaveC426913

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    What is your question? You're factoring a binomial.

    So, (x+a)(x+b)=0 factors to x*x + a*x + b*x + a*b = 0
     
  5. Nov 19, 2007 #4

    DaveC426913

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    Isn't this
    x^2 - 5x + 90
    ?
     
  6. Nov 19, 2007 #5

    rock.freak667

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    x(x - 10) - 5(x - 10)

    no no it isnt

    if you factor out (x-10 from above...you will get (x-10)(x-5)
     
  7. Nov 19, 2007 #6
    got it.......thankx
     
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