anonymous
  • anonymous
Simplify.. again!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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karatechopper
  • karatechopper
what to simplify?
anonymous
  • anonymous
\[\frac {x^{2}-12x+20}{x-10}\]
phi
  • phi
you have to factor the top.

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anonymous
  • anonymous
So, it'd be, x - 3x + 5?
phi
  • phi
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)
anonymous
  • anonymous
Alright.. I didn't know about that part.
phi
  • phi
once you have it factored up top, we can cancel the (x-10) from top and bottom
anonymous
  • anonymous
but wait..
anonymous
  • anonymous
What if I don't know the factors with numbers?
phi
  • phi
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
anonymous
  • anonymous
but I'm Simplifying Algebraic Ratios
phi
  • phi
That means they think you know algebra, including factoring quadratics
anonymous
  • anonymous
Would the answer be x-2?
phi
  • phi
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!
anonymous
  • anonymous
I see. And I lied about the factoring thing, I can factor numbers that are even or divisible by 5
phi
  • phi
If the video helps, notice that Khan has LOTS of videos on pretty much any topic you might have a question on.

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