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mopsy510

  • 3 years ago

I need help with my algebra homework! It has to do with "Completing a Square." Please help!

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  1. NotTim
    • 3 years ago
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    what exactly is the qun

  2. mopsy510
    • 3 years ago
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    3x^2-15x=0

  3. blahblah_who_cares
    • 3 years ago
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    use perfect squares.

  4. mopsy510
    • 3 years ago
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    Idk how kinda

  5. blahblah_who_cares
    • 3 years ago
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    oh wait. nvm. this is a bad example for perfect squares. use the quadratic formula

  6. mopsy510
    • 3 years ago
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    Whats the quadratic formula?

  7. mopsy510
    • 3 years ago
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    What?

  8. AravindG
    • 3 years ago
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    A quadratic equation is of the form \[ax^2+bx+c=0\] By method of completing the square , we write this as \[a(x-h)^2+constant\]

  9. blahblah_who_cares
    • 3 years ago
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    do not complete the square on this problem. the b is not divisible by 2.

  10. mopsy510
    • 3 years ago
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    So if i dont complete the suare what do i do?

  11. blahblah_who_cares
    • 3 years ago
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    the quadratic equation. which i have written.

  12. blahblah_who_cares
    • 3 years ago
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    |dw:1359606249803:dw|

  13. blahblah_who_cares
    • 3 years ago
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    that is the formula^^^

  14. mopsy510
    • 3 years ago
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    So its |dw:1359606358086:dw|

  15. mopsy510
    • 3 years ago
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    ?

  16. blahblah_who_cares
    • 3 years ago
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    no. because u do not have a c then last part of the term in the square root should be o. it should just be rad 15^2.

  17. blahblah_who_cares
    • 3 years ago
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    |dw:1359606587124:dw|

  18. mopsy510
    • 3 years ago
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    is that the answer?

  19. blahblah_who_cares
    • 3 years ago
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    nope. u have to simplify. u should come out with 2 answers for x.

  20. mopsy510
    • 3 years ago
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    Ok

  21. mopsy510
    • 3 years ago
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    Why is it over 2?

  22. blahblah_who_cares
    • 3 years ago
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    oh whoops. my bad. it should be over 6

  23. mopsy510
    • 3 years ago
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    Why is it over 6 then?

  24. blahblah_who_cares
    • 3 years ago
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    because ur a is 3. for the standard equation it is ax^2+bx+c

  25. mopsy510
    • 3 years ago
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    Ohh so you have to multiply it by 2?

  26. blahblah_who_cares
    • 3 years ago
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    yah

  27. mopsy510
    • 3 years ago
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    ohh

  28. mopsy510
    • 3 years ago
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    Can you help me with 16y^2+25=25

  29. blahblah_who_cares
    • 3 years ago
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    are u sure u arent saying 16y^2+25y=25?

  30. mopsy510
    • 3 years ago
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    Nope its just 25

  31. blahblah_who_cares
    • 3 years ago
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    well that makes it simple. what do you think u have to do?

  32. mopsy510
    • 3 years ago
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    I think i have to subtract 25 from each side so it becomes 16y^2=0

  33. blahblah_who_cares
    • 3 years ago
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    indeed

  34. blahblah_who_cares
    • 3 years ago
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    and what is the only possible answer for y?

  35. mopsy510
    • 3 years ago
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    16y^2

  36. mopsy510
    • 3 years ago
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    ?

  37. blahblah_who_cares
    • 3 years ago
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    no. there is only 1 possible answer in the world for the term y. So what do you think y equals.

  38. mopsy510
    • 3 years ago
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    196

  39. blahblah_who_cares
    • 3 years ago
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    so what u are telling me is that 16*196^2=0?

  40. mopsy510
    • 3 years ago
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    Ohh nvm. Is it 0?

  41. blahblah_who_cares
    • 3 years ago
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    indeed.

  42. mopsy510
    • 3 years ago
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    Isn't it suppose to have 2 answers?

  43. blahblah_who_cares
    • 3 years ago
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    for this equation no. for the previous one yes.

  44. mopsy510
    • 3 years ago
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    Ok. How would i complete the square for the equation y^2-3y?

  45. blahblah_who_cares
    • 3 years ago
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    u would not want to complete the square for it unless u have to. do u have to?

  46. mopsy510
    • 3 years ago
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    Yup

  47. mopsy510
    • 3 years ago
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    It just says "complete the square"

  48. mopsy510
    • 3 years ago
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    It doesn't say solve but the next equations say to solve

  49. blahblah_who_cares
    • 3 years ago
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    ok here is the way u would do it. u would first make the equation equal to zero. Then u get half of b and square it. and the square to both sides. in this case it would be 1.5^2. then you would get (x+1.5)^2=1.5^2. Square root. x+1.5=1.5 Something like that. my math may be wrong because im starting to feel not that great. Hope that helped.

  50. mopsy510
    • 3 years ago
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    Ok thanks

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