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Raeee_009

  • 3 years ago

x^2-9x+20 factorise quadratics

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  1. nubeer
    • 3 years ago
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    familiar with quadratic formula?

  2. Raeee_009
    • 3 years ago
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    no :(

  3. cwrw238
    • 3 years ago
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    this one can be factorized

  4. hartnn
    • 3 years ago
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    can u factorize @Raeee_009 ?

  5. hba
    • 3 years ago
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    Quadratic formula \[x=-b \pm \sqrt{b^2-4ac}/2a\]

  6. nubeer
    • 3 years ago
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    \[x = \frac{ -b \pm \sqrt{b ^{2}-4ac } }{ 2a}\] this is the quadratic formula now look at your equation it's x^2-9x+20 so a =1 ,b = -9 , c = 20 just plug in values you will get 2 values of x

  7. Raeee_009
    • 3 years ago
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    that is so confusing

  8. cwrw238
    • 3 years ago
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    yes - you asked about factoring quadratics factor to the form (x +/- a)(x +/- b)

  9. cwrw238
    • 3 years ago
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    to find a and b you need the product ad = +20 and sum = -9 can u think of 2 numbers which fit this requirement?

  10. cwrw238
    • 3 years ago
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    * product ab = + 20

  11. Raeee_009
    • 3 years ago
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    hmm.. still don't get it :(

  12. cwrw238
    • 3 years ago
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    20 = -4 * -5 right?

  13. Raeee_009
    • 3 years ago
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    yeah

  14. cwrw238
    • 3 years ago
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    and -4 + -5 = ?

  15. hba
    • 3 years ago
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    |dw:1353601861741:dw|

  16. Raeee_009
    • 3 years ago
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    -9

  17. cwrw238
    • 3 years ago
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    so thats your values of a and b hba has illustrated the process in his drawing

  18. Raeee_009
    • 3 years ago
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    ohh im understanding a bit now so is the answer (x-4) (x+9)

  19. cwrw238
    • 3 years ago
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    yea

  20. hba
    • 3 years ago
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    @cwrw238 No.

  21. cwrw238
    • 3 years ago
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    hba - your method is slightly different to mine - true

  22. hba
    • 3 years ago
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    I am talking about the answer she got ?

  23. cadex
    • 3 years ago
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    (x-4)(x-5)

  24. cwrw238
    • 3 years ago
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    oh yes - i misread it (x - 4)(x - 5) is correct solution a = -4 and b = -5 raee_009

  25. hba
    • 3 years ago
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    @Raeee_009 Please see my illustration and try to learn ? Where are you getting confused ?

  26. Raeee_009
    • 3 years ago
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    ohhhh! i get it now! thank you so much eveyone

  27. hba
    • 3 years ago
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    Your'e welcome.

  28. Raeee_009
    • 3 years ago
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    one quick question does a + and - = - ?

  29. hba
    • 3 years ago
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    Well (+)(+)=+ (+)(-)=- (-)(-)=+ Got it ?

  30. Raeee_009
    • 3 years ago
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    ohh yeah thanks :D

  31. Raeee_009
    • 3 years ago
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    so would x^2-6x-7=(x-7)(x+1)

  32. cwrw238
    • 3 years ago
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    right

  33. hba
    • 3 years ago
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    |dw:1353603740199:dw| @Raeee_009 Awesome :D

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