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eli123

  • 2 years ago

i really need some help

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  1. hartnn
    • 2 years ago
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    on which topic ?

  2. eli123
    • 2 years ago
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    quadratic equations

  3. eli123
    • 2 years ago
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  4. hartnn
    • 2 years ago
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    yes, i can help. post your question.

  5. eli123
    • 2 years ago
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    i did up to 55sqrtof -55^2-4(24)(-24) all over 48

  6. eli123
    • 2 years ago
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    which is 55 + or - sqrt of 721 all over 48

  7. eli123
    • 2 years ago
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    then i got stuck, i know i have to factor right?

  8. hartnn
    • 2 years ago
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    u have used quadratic formula to find roots, when it was asked to factor. if u only want an answer it doesn't matter what u use , factoring or formula...so do u want an answer or do u want to learn factoring?

  9. eli123
    • 2 years ago
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    i want to learn

  10. hartnn
    • 2 years ago
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    ok, so u got quadratic equation as 24p^2 -55 p -24 = 0 right ? now tell me 2 numbers whose product is -24*24 = -576 and sum is -55

  11. eli123
    • 2 years ago
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    that's the part that i hate, because it takes so long to find the numbers. there's no easy way to find them? or a trick

  12. eli123
    • 2 years ago
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    -64 and 9

  13. hartnn
    • 2 years ago
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    thats correct :) so u write your equation as 24p^2 -64p +9p -24 = 0 ok ? now what can u take out common from 1st 2 terms ??

  14. eli123
    • 2 years ago
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    p?

  15. hartnn
    • 2 years ago
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    p and ? what can u take common from 24 and 64 ?

  16. eli123
    • 2 years ago
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    4

  17. hartnn
    • 2 years ago
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    nice try .... what about 8 ?

  18. eli123
    • 2 years ago
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    yeah

  19. eli123
    • 2 years ago
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    and then the other one is 3(3p-8)

  20. hartnn
    • 2 years ago
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    so u take 8p common 8p(3p-8) + 3 (3p-8) = 0 got this ? yes, other part is correct

  21. eli123
    • 2 years ago
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    which gives you (8p+3)(3p-8)

  22. hartnn
    • 2 years ago
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    excellent, u are good at this :)

  23. eli123
    • 2 years ago
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    lol yeah right

  24. hartnn
    • 2 years ago
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    so your roots are ?

  25. hartnn
    • 2 years ago
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    8p+3 = 0 or 3p-8 = 0 u know what to do next?

  26. eli123
    • 2 years ago
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    ok so -3/8 and 8/3?

  27. hartnn
    • 2 years ago
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    exactly :)

  28. eli123
    • 2 years ago
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    thank you!

  29. hartnn
    • 2 years ago
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    welcome :) u did most part of the problem...

  30. eli123
    • 2 years ago
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    uh is there something i have to do after that? because it says its wrong

  31. eli123
    • 2 years ago
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    multiply?

  32. hartnn
    • 2 years ago
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    did u write it like this ? \(\huge{\frac{-3}{8},\frac{8}{3}}\) no,don't multiply...

  33. hartnn
    • 2 years ago
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    @eli123 ,did u get it right ?

  34. eli123
    • 2 years ago
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    i got it :) i had put the negative sign in front of the whole fraction :/ my bad @hartnn

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