anonymous
  • anonymous
V=(1/3)pie r^2h solve for r
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
that means that we want r by itself. So everything on the right hand side must go away except the r
anonymous
  • anonymous
\[V=\frac{1}{3}\pi r^2h\] What do you want to get rid of first?
anonymous
  • anonymous
um 1/3

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anonymous
  • anonymous
great that's division. Opposite of division is multiplication so we have to multiply both sides by 3\[3*V=3*\frac{1}{3}πr^2h\]\[3*V=πr^2h\]
anonymous
  • anonymous
now we must get rid of pi and h so we have to divide both sides by pi and h....what do you get then?
anonymous
  • anonymous
y by three
anonymous
  • anonymous
can you write it again?
anonymous
  • anonymous
|dw:1343255379829:dw|
anonymous
  • anonymous
\[\frac{3∗V}{\pi h }=\frac{πhr^2}{\pi h}\]
anonymous
  • anonymous
great now we need to square root both sides.
anonymous
  • anonymous
i dont know how
anonymous
  • anonymous
ok square root takes away the squared part in r^2 watch \[\frac{3V}{\pi h}=r^2\]\[\sqrt{\frac{3V}{\pi h}}= \sqrt{r^2}\]\[\sqrt{\frac{3V}{\pi h}}= r\]
anonymous
  • anonymous
but wait we square root both sides so we need the plus or minus\[\pm \sqrt{\frac{3V}{\pi h}} =r\]
anonymous
  • anonymous
huh
anonymous
  • anonymous
what does that mean
anonymous
  • anonymous
so whats the answer because i got confused
anonymous
  • anonymous
it's that. You have two answers one that is positive and one that is negative
anonymous
  • anonymous
that's what this sign means\[\pm \]
anonymous
  • anonymous
ohhhhhh okay wow thanks i didnt know that I am just going to high school so this is new

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