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Falling_In_Katt

  • one year ago

Which of the following expressions is a factor of the polynomial x ^ 2 +3/2 x - 1? A. x-1/2 B. x-2 C. x-1 D. x+3/2

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  1. Falling_In_Katt
    • one year ago
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    @Luigi0210

  2. Luigi0210
    • one year ago
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    Is it this? \(\large x^2+\frac{3}{2}x-11\)?

  3. Luigi0210
    • one year ago
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    Whoops, that's suppose to be 1 not 11

  4. Falling_In_Katt
    • one year ago
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    yes

  5. Luigi0210
    • one year ago
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    If you know synthetic division it would work great here

  6. Falling_In_Katt
    • one year ago
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    I have no clue how to do that.

  7. Luigi0210
    • one year ago
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    Well synthetic division is another way of doing long division. All you have to do is take the coefficients of the polynomial and write in an upside down division bar like so: |dw:1436559961111:dw| Since the coefficients of \(x^2+3/2 x -1 \) are 1, 3/2, and -1 On left you put what you are dividing by, so let's try x-1/2 \(x-\frac{1}{2}=0 \) so \(x=\frac{1}{2} \) |dw:1436560076049:dw|

  8. Luigi0210
    • one year ago
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    To solve, just bring down the first number: |dw:1436560162906:dw| Now just multiply by the left number and add it to the next number: |dw:1436560201845:dw|

  9. Luigi0210
    • one year ago
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    And just continue on till you get to the end: |dw:1436560295604:dw| And if you end up getting 0, then it means that it is a factor, so \(\large x-\frac{1}{2} \) is a factor.

  10. Falling_In_Katt
    • one year ago
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    Oh..

  11. Luigi0210
    • one year ago
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    If you don't know synthetic division you can always go the quadratic formula way: \(\Large \frac{- b \pm \sqrt{b^2 -4ac}}{2a}\) But knowing synthetic division would be great for you.

  12. Falling_In_Katt
    • one year ago
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    okay

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