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anonymous

  • 5 years ago

complete the square ? x2 + 8x = 11

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  1. anonymous
    • 5 years ago
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    What would you add to both sides?

  2. anonymous
    • 5 years ago
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    idk , 8

  3. anonymous
    • 5 years ago
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    You take half of the x term so half of 8 = 4 Then you square that answer 4^2 = 16

  4. anonymous
    • 5 years ago
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    do you know what the x term refers to?

  5. anonymous
    • 5 years ago
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    no how many times do i have to say math is thee worse subject i dont know how to do this

  6. anonymous
    • 5 years ago
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    the x term refers to the number in front of the x

  7. anonymous
    • 5 years ago
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    you are asked to make the given equation into a square.

  8. anonymous
    • 5 years ago
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    x^2+8x-11 = 0

  9. anonymous
    • 5 years ago
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    do you know what the formula for (a+b)^2 is?

  10. anonymous
    • 5 years ago
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    in other words, \[(a+b)^{2} = ?\]

  11. anonymous
    • 5 years ago
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    no

  12. anonymous
    • 5 years ago
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    okay, \[(a+b)^{2} = a ^{2}+ 2ab +b ^{2}\]

  13. anonymous
    • 5 years ago
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    so the example that i just put up how would that work

  14. anonymous
    • 5 years ago
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    compare \[x ^{2}+8x - 11.\] and \[a ^{2}+2ab+b ^{2}\]

  15. anonymous
    • 5 years ago
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    x is a. 2ab is 8x

  16. anonymous
    • 5 years ago
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    so what must you add to -11 to make it into b^2?

  17. anonymous
    • 5 years ago
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    2ab

  18. anonymous
    • 5 years ago
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    okay try again. when you compare the two equations, you see that x = a. correct? and 2ab = 8x. so find the value of b.

  19. anonymous
    • 5 years ago
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    which grade are you in?

  20. anonymous
    • 5 years ago
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    idk , im srry im not Tht qood in math

  21. anonymous
    • 5 years ago
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    okay, 2ab = 8x, divide by 2a on both sides. => b = 8x/2a you know that x = a so what is the value of b?

  22. anonymous
    • 5 years ago
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    16 , i did 8*2 16

  23. anonymous
    • 5 years ago
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    i mean 4 ,

  24. anonymous
    • 5 years ago
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    okay good.

  25. anonymous
    • 5 years ago
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    thats riqqht

  26. anonymous
    • 5 years ago
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    so for (a+b)^2 to be equal to (x+4)^2, what must you add to x^2 +8x-11?

  27. anonymous
    • 5 years ago
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    expand (x+4)^2.

  28. anonymous
    • 5 years ago
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    maybe 2 0r 4 because i did 8\[\div\]2 qive me 4 then i square root that and qave me 2.

  29. anonymous
    • 5 years ago
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    what? you found out that x = a and 4 = b. so your complete square is (x+4)^2. so expand (x+4)^2 using the formula i gave earlier.

  30. anonymous
    • 5 years ago
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    okay \[(x+4)^{2}= x ^{2}+8x+16\]

  31. anonymous
    • 5 years ago
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    im in the 12th .

  32. anonymous
    • 5 years ago
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    you are in 12th grade and don't know what (a+b)^2 is ?That is very surprising. Anyway, compare the expanded version of (x+4)^2 i gave you with your original formula, x2+8x-11

  33. anonymous
    • 5 years ago
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    how much do you need to add to x2+8x-11 to get x2+8x+16?

  34. anonymous
    • 5 years ago
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    itss not because to mee math is hard for one and for two yu dont have to help mee someone else can if its like that im on here for help not for someone to tell im in the 12th i dont know what something is i guess maybe it dont get through to mee to many smart retricepeople wrong thing for me to come to flutter .

  35. anonymous
    • 5 years ago
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    im dont off this question anyway .

  36. anonymous
    • 5 years ago
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    make some sense. I did not want to offend you. I was just surprised. I thought basic algebra was taught in 8th grade or something.

  37. anonymous
    • 5 years ago
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    you know what flutter you and your negative attititude if yu aint going to help go some where with you ignorgant self and it probably was and wht its 2011 not 2007

  38. anonymous
    • 5 years ago
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    okay, have a pleasant day.

  39. anonymous
    • 5 years ago
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    you to , feather ! *

  40. anonymous
    • 5 years ago
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    Ah, well at least I'm not stupid.

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