anonymous
  • anonymous
Solve the following system. 4x^2 + 9y^2 =72 x^2 - y^2 = 5 The solutions are?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
i've tried to do this at least 5 times. i don't understand it at all
mathslover
  • mathslover
|dw:1337656235090:dw|
mathslover
  • mathslover
|dw:1337656263685:dw|

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More answers

mathslover
  • mathslover
|dw:1337656308816:dw|
anonymous
  • anonymous
or multiply the second equation by -4
mathslover
  • mathslover
|dw:1337656338440:dw|
mathslover
  • mathslover
|dw:1337656365038:dw|
mathslover
  • mathslover
|dw:1337656398578:dw|
anonymous
  • anonymous
\[4x^2+9y^2=72\] \[-4(x^2-y^2)=-4(5)\]
mathslover
  • mathslover
|dw:1337656433069:dw|
anonymous
  • anonymous
there's supposed to be 2 solutions: The solutions are: (_,_) & (_,_)
anonymous
  • anonymous
\[4x^2+9y^2=72\] \[-4x^2+4y^2=-20\] add them together to get \[13y^2=52\]
anonymous
  • anonymous
trust me, i've gotten all the solutions possible. but the answer is still wrong.
anonymous
  • anonymous
\[y^2=\sqrt{\frac{52}{13}}\]
mathslover
  • mathslover
the solutions are : sqrt(52/11) and sqrt(107/11)
anonymous
  • anonymous
but there's 4 solutions.
mathslover
  • mathslover
@ outkast i think y = sqrt(52/11) u wrote y^2 = sqrt(52/13) ?
anonymous
  • anonymous
yeah i think there might be aproblem with your's mine is correct i thinkkk let me check
anonymous
  • anonymous
yeah mine is correct .. by elimination
mathslover
  • mathslover
u can write it as : |dw:1337656633671:dw|
radar
  • radar
\[y=\pm2\]\[x=\pm3\]
anonymous
  • anonymous
i also got that ^
anonymous
  • anonymous
i'ma cheat *grabs calculator
anonymous
  • anonymous
lol, i've done that too! ^
anonymous
  • anonymous
ahh wait mathslover you have 7 instead of 9
mathslover
  • mathslover
hey sorry , i took 4x^2 + 7y^2 but it is 4x^2 + 9y^2 , therefore the 4 solutions are : |dw:1337656820684:dw|
anonymous
  • anonymous
i believe you made a 9 really badly and thought it was a 7 the first equation is 4x^2+9y^2=72
anonymous
  • anonymous
For y, I got y= +/- sqrt (52/13)
anonymous
  • anonymous
thats right now for x
mathslover
  • mathslover
yes sorry , y = + 2 , -2 x = +3 , -3
mathslover
  • mathslover
@Outkast3r09 x = +3 , -3 right ?
anonymous
  • anonymous
\[x^2-(2^2)=5\] \[x^2-(-2^2)=5\]
anonymous
  • anonymous
x = +/- 3
anonymous
  • anonymous
\[x^2-4=5\] \[x^2-4=5\]
radar
  • radar
\[\sqrt{52/13}=\pm2\]\[x ^{2}=9\]\[x=\pm3\]
anonymous
  • anonymous
I was slow, I was using a crappy calculator.
anonymous
  • anonymous
does this mean it's a multiplicity of 2?
anonymous
  • anonymous
@thejoshfish did you try putting in y= +/- sqrt (52/13) and x=+/- 3?
anonymous
  • anonymous
@Outkast3r09 it means 3*3 and (-3)(-3).
anonymous
  • anonymous
i sure did. haha trust me, i tried everything. i'm so fed up. but you guys are wonderful.
anonymous
  • anonymous
those are your answers are you using like owl or whatever
anonymous
  • anonymous
owl?
anonymous
  • anonymous
Talk with your instructor. I'm taking statics and have the instructor's manual. They're wrong way more times than I'd like them to be. I think the grad students who write the manuals aren't getting enough sleep.
anonymous
  • anonymous
Online web learning
anonymous
  • anonymous
what does it say the answers are josh?
anonymous
  • anonymous
alpha omega academy
anonymous
  • anonymous
it doesn't tell me. but thanks for helping.
anonymous
  • anonymous
sometimes those sites have like a function button with like +- and what not . that could be the problem or try 3,-3 , -2 ,2
anonymous
  • anonymous
If you have to take the higher level physics series, they might make you use MasteringPhysics. Have fun with that! Groans.

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