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Christos

  • one year ago

Can you teach me how to do long division?

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  1. Luigi0210
    • one year ago
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    Any specific examples..?

  2. smokeydabear
    • one year ago
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    I can teach you my more kid-friendly approach to long division, if that's okay with you.

  3. Christos
    • one year ago
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    2x^3-3x^2-36x+5

  4. smokeydabear
    • one year ago
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    Oh that sort of long division... Yeah I always forget that. Luigi, I summon thee!

  5. Luigi0210
    • one year ago
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    What are you dividing it by?

  6. Christos
    • one year ago
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    diving by x - 5

  7. Luigi0210
    • one year ago
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    There's an easier way. Have you learned synthetic division?

  8. Christos
    • one year ago
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    No can you teach me please

  9. Luigi0210
    • one year ago
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    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|

  10. Christos
    • one year ago
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    the result is 2x^3+7x-1 ?

  11. Luigi0210
    • one year ago
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    no 2x^2

  12. Christos
    • one year ago
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    can you explain to me how you got those numbers at your image

  13. Christos
    • one year ago
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    These ones http://screencast.com/t/lqjFKcJA

  14. Luigi0210
    • one year ago
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    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

  15. Christos
    • one year ago
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    thank you

  16. Luigi0210
    • one year ago
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    Synthetic division only works with linear equations.

  17. Christos
    • one year ago
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    what do you mean by "linear" ?

  18. Christos
    • one year ago
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    @Luigi0210

  19. Luigi0210
    • one year ago
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    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.

  20. Christos
    • one year ago
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    I see :)

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