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anonymous

  • 5 years ago

completeing the square: x^2-10x-5=9

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  1. anonymous
    • 5 years ago
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    You first get the constant numbers to the opposite side of the x^2, so get the -5 to the other side.

  2. anonymous
    • 5 years ago
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    x^2 - 10x = 14 do you understand this, so far?

  3. anonymous
    • 5 years ago
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    got it!!!!!! thank you so much!

  4. anonymous
    • 5 years ago
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    what did you get for an answer?

  5. anonymous
    • 5 years ago
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    x=+- square root of 39?

  6. anonymous
    • 5 years ago
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    x=5+_ square root of 39

  7. anonymous
    • 5 years ago
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    x^2 - 10x + 25 = 14 + 25 (x - 10)^2 = 39 x - 10 = +-sqrt(39) x = +- sqrt(39) + 10

  8. anonymous
    • 5 years ago
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    whered you get the 10 from?

  9. anonymous
    • 5 years ago
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    it factors to (x-5)^2

  10. anonymous
    • 5 years ago
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    OOPS you are correct....

  11. anonymous
    • 5 years ago
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    haha no worries

  12. anonymous
    • 5 years ago
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    but then you need to add 5 to both sides... x = +-sqrt(39) + 5 sorry I was texting and doing math at the same time.

  13. anonymous
    • 5 years ago
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    blexting can you help with a few more questions?

  14. anonymous
    • 5 years ago
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    Sure

  15. anonymous
    • 5 years ago
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    M: 2/m + 3/m+9= 11/4

  16. anonymous
    • 5 years ago
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    You need to find a common denominator.. is the + 9 in the denominator or all by itself?

  17. anonymous
    • 5 years ago
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    m+9

  18. anonymous
    • 5 years ago
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    So the denominators are m and m + 9 and 4 so your common denominator is 4m(m+9) do you agree?

  19. anonymous
    • 5 years ago
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    yes i agreee!!!

  20. anonymous
    • 5 years ago
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    so we multiply everything by that correct?

  21. anonymous
    • 5 years ago
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    top and bottom?

  22. anonymous
    • 5 years ago
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    8(m+9)+12m =......

  23. anonymous
    • 5 years ago
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    Because you have denominators and an equal sign. you need to multiply each term by your common denominator. 4m(m+9)*2/m + 4m(m+9) * 3/(m+9) = 4m(m+9)*11/4

  24. anonymous
    • 5 years ago
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    Cancel the denominators into the numerators

  25. anonymous
    • 5 years ago
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    4(m+9)*2 + 4m*3 = m(m+9)*11

  26. anonymous
    • 5 years ago
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    8(m+9) + 12m = 11m(m+9)

  27. anonymous
    • 5 years ago
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    8m + 72 + 12m = 11m^2 + 99m

  28. anonymous
    • 5 years ago
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    Because you have an equal sign and an x^2 term you need to put the other side = to 0.

  29. anonymous
    • 5 years ago
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    0 = 11m^2 + 79m - 72

  30. anonymous
    • 5 years ago
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    I would use the quadratic formula here.. Do you agree with my steps so far?

  31. anonymous
    • 5 years ago
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    0 = (11m + 9)(m +8) m = -9/11 or -8 sorry it factors.

  32. anonymous
    • 5 years ago
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    im confuseddd ahhhhhhh i got 10.5

  33. anonymous
    • 5 years ago
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    i think i got it!

  34. anonymous
    • 5 years ago
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    omg got it!

  35. anonymous
    • 5 years ago
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    Great...

  36. anonymous
    • 5 years ago
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    i <3 you

  37. anonymous
    • 5 years ago
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    wanna be our math tutor for the night? i have another problem :D

  38. anonymous
    • 5 years ago
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    Sure... for awhile.

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