Christos
  • Christos
Can you teach me how to do long division?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Luigi0210
  • Luigi0210
Any specific examples..?
anonymous
  • anonymous
I can teach you my more kid-friendly approach to long division, if that's okay with you.
Christos
  • Christos
2x^3-3x^2-36x+5

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anonymous
  • anonymous
Oh that sort of long division... Yeah I always forget that. Luigi, I summon thee!
Luigi0210
  • Luigi0210
What are you dividing it by?
Christos
  • Christos
diving by x - 5
Luigi0210
  • Luigi0210
There's an easier way. Have you learned synthetic division?
Christos
  • Christos
No can you teach me please
Luigi0210
  • Luigi0210
Synthetic division is like upside down division. So for the problem \[\frac{ 2x^3-3x^2-36x+5 }{ x-5 }\] It would look like this: |dw:1368504397441:dw|
Christos
  • Christos
the result is 2x^3+7x-1 ?
Luigi0210
  • Luigi0210
no 2x^2
Christos
  • Christos
can you explain to me how you got those numbers at your image
Christos
  • Christos
These ones http://screencast.com/t/lqjFKcJA
Luigi0210
  • Luigi0210
For synthetic division first what you do is solve for x: x-5=0 x=5 -------------------------------------------------- Now just take the coefficients of the equation and plug them in. When it is set up you then drop the first number, like in the example we dropped the 2. Next we would multiply it by 5 and add it to the next coefficient and then repeat. So 5*2 is 10. and -3+10 is 7.and 7*5 is 35. 35+-36 which is -1. and -1*5 is -5 and so on
Christos
  • Christos
thank you
Luigi0210
  • Luigi0210
Synthetic division only works with linear equations.
Christos
  • Christos
what do you mean by "linear" ?
Christos
  • Christos
@Luigi0210
Luigi0210
  • Luigi0210
Like you can't use this method if you're dividing by like x^2 and beyond. It only works with x+5, x-2, 5x+9, etc.
Christos
  • Christos
I see :)

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