Help with Pre-Cal?

- BloomLocke367

Help with Pre-Cal?

- katieb

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- jdoe0001

posting specifics helps

- BloomLocke367

It says to solve algebraically and confirm graphically, and the first problem is \(v^2-5=8-2v^2\)

- BloomLocke367

I was getting there, lol XD

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## More answers

- jdoe0001

\(\bf v^2-5=8-2v^2\implies v^2+2v^2=8+5\implies v=?\)

- triciaal

put the variables on one side constants on the other
keep the balance of the equation

- BloomLocke367

When I solved aglebraically I got \(v=\sqrt{\frac{13}{3}}\)

- 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

oops, I meant to say when I graphed it, it didn't match my algebraic solution.

- 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

I forgot to put that, but I know that. lol

- jdoe0001

hmmm ok.... so.. whathmm how did you do the graph anyway? just a table of values?

- BloomLocke367

I set the equations equal to zero

- BloomLocke367

and used a calculator

- BloomLocke367

equation**

- jdoe0001

so.... I'd think... the graph is ok...no?

- BloomLocke367

obviously, I got a parabola with the y-intercept -13. And my zeroes were \(\pm\)2.082

- BloomLocke367

Is that correct?

- jdoe0001

\(\bf \pm\sqrt{\cfrac{13}{3}}=\pm2.08166599946613273528\) so, the zeros look fine

- BloomLocke367

ohhhh... so I was right, sorry. I was thinking of something else when I graphed it and that was my problem lol

- BloomLocke367

Thanks *facepalm*

- triciaal

|dw:1440630977887:dw|

- BloomLocke367

Thanks!

- 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

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

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

Very wise. I have another one, but I think I need to use completing the square to do it.. Can you maybe help?

- jdoe0001

sure, post anew, more eyes :)

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