anonymous
  • anonymous
What is the value of y^-5/x^-3 for x = 2 and y = -4?
Mathematics
jamiebookeater
  • jamiebookeater
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Sepeario
  • Sepeario
So we have the equation \[\frac{ -4^{-5} }{ 2^{-3} }\]
Sepeario
  • Sepeario
Which then means \[\frac{ (-4*-4*-4*-4*-4)^{-1} }{ (2*2*2)^{-1} }\]
Sepeario
  • Sepeario
Can you evaluate that?

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anonymous
  • anonymous
-256/-8
Sepeario
  • Sepeario
Check your answer. What is -4^5. And where did you get the negative from the bottom?
anonymous
  • anonymous
idk what im doing
Sepeario
  • Sepeario
haha no stress.
anonymous
  • anonymous
-1024/8
anonymous
  • anonymous
ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh 128
Sepeario
  • Sepeario
Yes, but remember how both of them are two the power of negative 1? That means that they are inverse, giving you the fraction 8/-1024
anonymous
  • anonymous
but would it be -128?
Sepeario
  • Sepeario
No, the fraction is inversed. The answer isn't -1024/8.
anonymous
  • anonymous
-1/128
Sepeario
  • Sepeario
Yes! well done.
anonymous
  • anonymous
yayyyyyy thank you :))))
Sepeario
  • Sepeario
all good.

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