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anonymous

  • 5 years ago

clarification on the answer for this quadratic equation!

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  1. anonymous
    • 5 years ago
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    \[-4x ^{2}-x=-2\]

  2. anonymous
    • 5 years ago
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    right now I have \[x=1+ or - \sqrt{-31}\over -8\] I don't know if there can be any more done

  3. anonymous
    • 5 years ago
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    I never know when exactly the i's come into play..

  4. amistre64
    • 5 years ago
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    4x^2 +x -2 = 0 -1/8 +- sqrt(33)/8 should be the answer

  5. amistre64
    • 5 years ago
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    put everything on the side that makes the x^2 part positive...

  6. anonymous
    • 5 years ago
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    so there are 2 non real answers?

  7. amistre64
    • 5 years ago
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    0 = 4x^2 +x -2 is alot easier to play with :)

  8. amistre64
    • 5 years ago
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    there are 2 real answers. why you get sqrt(-31)? thats wrong

  9. amistre64
    • 5 years ago
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    sqrt(1-(4)(4)(-2)) = sqrt(33)

  10. anonymous
    • 5 years ago
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    1-32 is how I got that.. 4 times a times c is what my format told me to do.. hmm. must have messed something up

  11. amistre64
    • 5 years ago
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    get your quad to be a positive 4x^2..... you can put that stuff on either side of the equals sign to make life easier.

  12. amistre64
    • 5 years ago
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    sqrt(1 -(4)(4)(-2)) = sqrt(1 + 32) = sqrt(33)

  13. anonymous
    • 5 years ago
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    gotcha. I see where I messed up, thanks! Would you mind helping with this one once I work out the answer, just to make sure i'm doing it right?:)

  14. amistre64
    • 5 years ago
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    not a problem

  15. anonymous
    • 5 years ago
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    \[X ^{2}+10X+25=0\] Is the problem.

  16. anonymous
    • 5 years ago
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    so far I have \[-10 + or - \sqrt{4}\over 2\] So i'm wondering if the 2 and 4 turn into 2 over 1...?

  17. amistre64
    • 5 years ago
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    if we want to really work this with the quad formula then we should get: -10/2 +- sqrt(100 -(4)(25))/2 -10/2 +- sqrt(100-100)/2 <- thats zero -10/2 = -5

  18. anonymous
    • 5 years ago
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    ohh i did 100-96 to get that. i wrote 24 instead of 25..My bad. So is there only 1 solution for this?

  19. amistre64
    • 5 years ago
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    yes, only one solution. It touches the x axis in only one place....x = -5

  20. anonymous
    • 5 years ago
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    thank you!

  21. amistre64
    • 5 years ago
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    youre welcome :)

  22. anonymous
    • 5 years ago
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    I have like 10 more of these so i'll probably keep posting them on here to make sure I get them right. So if you don't mind I will just stay on this window and show them to you, otherwise I can see if others want to help. It's up to you! I understand if you have better things to do :)

  23. amistre64
    • 5 years ago
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    better things? no, but I might not be able to get to them, so post them in the left side so others can have a chance at them :)

  24. anonymous
    • 5 years ago
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    Ok sounds good! Ha, thanks for your help :)

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