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Kathatesmath94

I have a multiple choice question but my answer doesn't match my answer choices... Can someone tell me what i did wrong???

  • one year ago
  • one year ago

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  1. lilg132
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    yes show me what you've done and the question

    • one year ago
  2. Kathatesmath94
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    |dw:1354239603490:dw|

    • one year ago
  3. Kathatesmath94
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    thats the answer i chose but it says it is wrong.... my answer choices are: -5+18sqrt5 -5+38sqrt5 35+20sqrt5 35+10sqrt5--- the answer i chose and it says it is wrong... I am not sure why or what i did wrong can someone please help??

    • one year ago
  4. lilg132
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    the last bit is wrong its not -80 its -40

    • one year ago
  5. Kathatesmath94
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    oh that was -8sqrt5

    • one year ago
  6. lilg132
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    -5 + 18 sqrt 5

    • one year ago
  7. lilg132
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    that last bit is -8 sqrt 5?

    • one year ago
  8. lilg132
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    it shouldn't be it should be -40

    • one year ago
  9. Kathatesmath94
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    yeah cause it is 2sqrt5*4sqrt5

    • one year ago
  10. lilg132
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    yes that should give you - 40

    • one year ago
  11. Kathatesmath94
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    how did you get-40?? im a little confused

    • one year ago
  12. lilg132
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    5 * 4 = 20 * -2

    • one year ago
  13. lilg132
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    = -40

    • one year ago
  14. Kathatesmath94
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    where does the 5 come from? the sqrt?

    • one year ago
  15. lilg132
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    yes

    • one year ago
  16. Kathatesmath94
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    so you take one of the 5's from one of the sqrt and leave the other one?

    • one year ago
  17. lilg132
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    ok ignore the way i said let me try and explain the way you do it

    • one year ago
  18. lilg132
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    so we have -2 sqrt 5 * 4 sqrt 5

    • one year ago
  19. lilg132
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    -2 * 4 = -8

    • one year ago
  20. Kathatesmath94
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    im sorry I just want to make sure i understand where the 5 comes from

    • one year ago
  21. lilg132
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    sqrt 5 * sqrt 5 = 5

    • one year ago
  22. lilg132
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    so we multiply -8 * 5 = -40

    • one year ago
  23. lilg132
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    is that easier to understand?

    • one year ago
  24. Kathatesmath94
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    oh so the sqrt * the same swrt will just be the number??

    • one year ago
  25. lilg132
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    yes

    • one year ago
  26. Kathatesmath94
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    that makes perfect sense actually

    • one year ago
  27. lilg132
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    good :)

    • one year ago
  28. lilg132
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    let me know if your confused about anything

    • one year ago
  29. Kathatesmath94
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    thank you soo much for explainging it and not just giving me the answer. if I have any other problem I will post them for sure. I really appreciate it

    • one year ago
  30. lilg132
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    your welcome =)

    • one year ago
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