anonymous
  • anonymous
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Mathematics
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
you want help or the answer?
anonymous
  • anonymous
how do you find the extraneous root? I need help finding it

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anonymous
  • anonymous
@surdawi
anonymous
  • anonymous
cross multiply |dw:1352736853722:dw|
anonymous
  • anonymous
done... is this how i find the extraneous root?
anonymous
  • anonymous
I have y =5 already
anonymous
  • anonymous
y = 5 is correct
anonymous
  • anonymous
i only need help finding the EXTRANEOUS ROOT
anonymous
  • anonymous
\[\frac{ 1 }{ y-1 }=\frac{ 2 }{ y+2 }....where...y \neq1 ,-2\]\[2(y-1)=y+2\]\[2y-2=y+2\]\[y=4\]
amistre64
  • amistre64
EXTRAneous roots are roots that are introduced as a byproduct of running thru the algebra. they are values which can be produced thru the algebraic manipulations but are not accepted as solutions to the problem
anonymous
  • anonymous
Thus the answers will be y= 1 and y = -2?
anonymous
  • anonymous
how do yu identify if i have any in this problem?
amistre64
  • amistre64
extra roots tend to be the result of needing to square something to produce an outcome. 2y-4 = y+1 only has one solution, when y=5

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