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careless850 Group Title

Simplify.. again!

  • 2 years ago
  • 2 years ago

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  1. karatechopper Group Title
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    what to simplify?

    • 2 years ago
  2. careless850 Group Title
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    \[\frac {x^{2}-12x+20}{x-10}\]

    • 2 years ago
  3. phi Group Title
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    you have to factor the top.

    • 2 years ago
  4. careless850 Group Title
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    So, it'd be, x - 3x + 5?

    • 2 years ago
  5. phi Group Title
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    list the factors of the 3rd number 20 1,20 2,10 4,5 do any add up to 12 if so, that is the pair to use. the sign of the 2nd number (-12) tells you to make the factors negative I would use (x-2)(x-10)

    • 2 years ago
  6. careless850 Group Title
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    Alright.. I didn't know about that part.

    • 2 years ago
  7. phi Group Title
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    once you have it factored up top, we can cancel the (x-10) from top and bottom

    • 2 years ago
  8. careless850 Group Title
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    but wait..

    • 2 years ago
  9. careless850 Group Title
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    What if I don't know the factors with numbers?

    • 2 years ago
  10. phi Group Title
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    I think that means you have to practice.... Here is a video, when you have time http://www.khanacademy.org/math/algebra/polynomials/v/factoring-quadratic-expressions

    • 2 years ago
  11. careless850 Group Title
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    but I'm Simplifying Algebraic Ratios

    • 2 years ago
  12. phi Group Title
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    That means they think you know algebra, including factoring quadratics

    • 2 years ago
  13. careless850 Group Title
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    Would the answer be x-2?

    • 2 years ago
  14. phi Group Title
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    yes. you can test the answer pick a simple number like x=0. If your answer is correct (x-2) with x=0 is 0-2= -2 replace x=0 into the original problem: and you get 20/-10= -2 It matches!

    • 2 years ago
  15. careless850 Group Title
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    I see. And I lied about the factoring thing, I can factor numbers that are even or divisible by 5

    • 2 years ago
  16. phi Group Title
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    If the video helps, notice that Khan has LOTS of videos on pretty much any topic you might have a question on.

    • 2 years ago
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