BloomLocke367
  • BloomLocke367
Help with Pre-Cal?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jdoe0001
  • jdoe0001
posting specifics helps
BloomLocke367
  • BloomLocke367
It says to solve algebraically and confirm graphically, and the first problem is \(v^2-5=8-2v^2\)
BloomLocke367
  • BloomLocke367
I was getting there, lol XD

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jdoe0001
  • jdoe0001
\(\bf v^2-5=8-2v^2\implies v^2+2v^2=8+5\implies v=?\)
triciaal
  • triciaal
put the variables on one side constants on the other keep the balance of the equation
BloomLocke367
  • BloomLocke367
When I solved aglebraically I got \(v=\sqrt{\frac{13}{3}}\)
BloomLocke367
  • BloomLocke367
But when I graphed it, I don't think it's right... but I may have made an error. That's why I'm asking for help.
BloomLocke367
  • BloomLocke367
oops, I meant to say when I graphed it, it didn't match my algebraic solution.
jdoe0001
  • jdoe0001
notice, is a quadratic equation, 2nd degree polynomial, thus 2 answers \(\bf v^2-5=8-2v^2\implies v^2+2v^2=8+5\implies v=\pm\sqrt{\cfrac{13}{3}}\)
BloomLocke367
  • BloomLocke367
I forgot to put that, but I know that. lol
jdoe0001
  • jdoe0001
hmmm ok.... so.. whathmm how did you do the graph anyway? just a table of values?
BloomLocke367
  • BloomLocke367
I set the equations equal to zero
BloomLocke367
  • BloomLocke367
and used a calculator
BloomLocke367
  • BloomLocke367
equation**
jdoe0001
  • jdoe0001
so.... I'd think... the graph is ok...no?
BloomLocke367
  • BloomLocke367
obviously, I got a parabola with the y-intercept -13. And my zeroes were \(\pm\)2.082
BloomLocke367
  • BloomLocke367
Is that correct?
jdoe0001
  • jdoe0001
\(\bf \pm\sqrt{\cfrac{13}{3}}=\pm2.08166599946613273528\) so, the zeros look fine
BloomLocke367
  • BloomLocke367
ohhhh... so I was right, sorry. I was thinking of something else when I graphed it and that was my problem lol
BloomLocke367
  • BloomLocke367
Thanks *facepalm*
triciaal
  • triciaal
|dw:1440630977887:dw|
BloomLocke367
  • BloomLocke367
Thanks!
jdoe0001
  • jdoe0001
http://fooplot.com/#W3sidHlwZSI6MCwiZXEiOiIzeF4yLTEzIiwiY29sb3IiOiIjMDAwMDAwIn0seyJ0eXBlIjoxMDAwLCJ3aW5kb3ciOlsiLTguMzQ5OTk5OTk5OTk5OTk4IiwiNy45IiwiLTEzLjU1MDAwMDAwMDAwMDAwMiIsIi0zLjU0OTk5OTk5OTk5OTk5OSJdfV0- drag the graph down, to see the intercepts anyhow, you can zoom in/out by using the mouse middle-button so those are the intercepts
BloomLocke367
  • BloomLocke367
yeah, I have the graph right in front of me. I was just thinking I was looking for something else, I don't know why. XD
jdoe0001
  • jdoe0001
In every work of genius we recognize our own rejected thoughts: they come back to us with a certain alienated majesty. ~~ Ralph Waldo Emerson ~~
BloomLocke367
  • BloomLocke367
Very wise. I have another one, but I think I need to use completing the square to do it.. Can you maybe help?
jdoe0001
  • jdoe0001
sure, post anew, more eyes :)

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