anonymous
  • anonymous
evaluate 2x^-1y^3 if x=2 and y=-1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
insert 2 instead of x and insert -1 instead of y
anonymous
  • anonymous
\[2(2)^{-1}-1^{3}\]
anonymous
  • anonymous
like that now what do i do

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anonymous
  • anonymous
\[2(2)^{-1}(-1)^{3}\]
anonymous
  • anonymous
\[n^{-1}=\frac{1}{n}\] \[n^3=n\cdot n\cdot n\]
anonymous
  • anonymous
okay i understand that part i just need help with the combined part
anonymous
  • anonymous
so just multiply and subtract answers you get
anonymous
  • anonymous
(\[1/4* 1^{-3}\]
anonymous
  • anonymous
im confused
anonymous
  • anonymous
\[x^{-1}= 1/x\] so |dw:1324153439822:dw|
anonymous
  • anonymous
wait \[1/4(1^{3})\]
anonymous
  • anonymous
plugging your numbers
anonymous
  • anonymous
|dw:1324153490541:dw|
anonymous
  • anonymous
|dw:1324153521385:dw|
anonymous
  • anonymous
what you think?
anonymous
  • anonymous
-1
anonymous
  • anonymous
yes
anonymous
  • anonymous
thanks soo much

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