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anonymous

  • 5 years ago

Y=x^2-6x-8 Find roots by factoring or quadratic formula if factoring doesnt work.

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  1. anonymous
    • 5 years ago
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    You sure it's -8?

  2. anonymous
    • 5 years ago
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    yup, y=x^2-6x-8. Yup. Positive

  3. anonymous
    • 5 years ago
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    You're gonna want to use the quadratic formula for this one.

  4. anonymous
    • 5 years ago
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    Thought so. I dunno why, but the first time i tried, i got -38,0 and like -26,0 or something like that. i knew it was completely wrong tho...Haha

  5. anonymous
    • 5 years ago
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    Cause the only integer factors of 8 are 4 and 2, but they can't both be negative (to give -6) without the 8 being positive.

  6. anonymous
    • 5 years ago
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    Hmm..

  7. anonymous
    • 5 years ago
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    So you're gonna get non-integers

  8. anonymous
    • 5 years ago
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    So Decimals... Hopefully theyre only .5

  9. anonymous
    • 5 years ago
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    polpack will you help me?

  10. anonymous
    • 5 years ago
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    K i'll solve it.

  11. anonymous
    • 5 years ago
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    I just leave em as fractions usually

  12. anonymous
    • 5 years ago
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    but then my teachers rarely let us use calculators

  13. anonymous
    • 5 years ago
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    She's fine with us using them. she just likes us to try without them. you can play cards on our calculators..haha

  14. anonymous
    • 5 years ago
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    polpak. can you help me

  15. anonymous
    • 5 years ago
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    \[x=\frac{6 \pm\sqrt{36 - 4(-8)}}{2} = 3 \pm \frac{\sqrt{68}}{2} = 3 \pm \frac{\sqrt{4\times 17}}{2} = 3 \pm \sqrt{17}\]

  16. anonymous
    • 5 years ago
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    but theres no variables in that. :(

  17. anonymous
    • 5 years ago
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    those are the roots, sorry.

  18. anonymous
    • 5 years ago
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    to factor just say \(y = (x-3+\sqrt{17})(x-3-\sqrt{17})\)

  19. anonymous
    • 5 years ago
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    polpak i need help please!

  20. anonymous
    • 5 years ago
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    ohh, so all i need to do is...ohh, okay...THANKS!

  21. anonymous
    • 5 years ago
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    ohh, so all i need to do is...ohh, okay...THANKS!

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