anonymous
  • anonymous
Y=x^2-6x-8 Find roots by factoring or quadratic formula if factoring doesnt work.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
You sure it's -8?
anonymous
  • anonymous
yup, y=x^2-6x-8. Yup. Positive
anonymous
  • anonymous
You're gonna want to use the quadratic formula for this one.

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anonymous
  • anonymous
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
anonymous
  • anonymous
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.
anonymous
  • anonymous
Hmm..
anonymous
  • anonymous
So you're gonna get non-integers
anonymous
  • anonymous
So Decimals... Hopefully theyre only .5
anonymous
  • anonymous
polpack will you help me?
anonymous
  • anonymous
K i'll solve it.
anonymous
  • anonymous
I just leave em as fractions usually
anonymous
  • anonymous
but then my teachers rarely let us use calculators
anonymous
  • anonymous
She's fine with us using them. she just likes us to try without them. you can play cards on our calculators..haha
anonymous
  • anonymous
polpak. can you help me
anonymous
  • anonymous
\[x=\frac{6 \pm\sqrt{36 - 4(-8)}}{2} = 3 \pm \frac{\sqrt{68}}{2} = 3 \pm \frac{\sqrt{4\times 17}}{2} = 3 \pm \sqrt{17}\]
anonymous
  • anonymous
but theres no variables in that. :(
anonymous
  • anonymous
those are the roots, sorry.
anonymous
  • anonymous
to factor just say \(y = (x-3+\sqrt{17})(x-3-\sqrt{17})\)
anonymous
  • anonymous
polpak i need help please!
anonymous
  • anonymous
ohh, so all i need to do is...ohh, okay...THANKS!
anonymous
  • anonymous
ohh, so all i need to do is...ohh, okay...THANKS!

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