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NeedsGoodAnswer

Simplify 3^-9 / 3^-12

  • 2 years ago
  • 2 years ago

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  1. NeedsGoodAnswer
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    answers: 3^3 3^21 1/3^21 1/3^3

    • 2 years ago
  2. asnaseer
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    do you know the rule:\[x^a/x^b=x^{a-b}\]

    • 2 years ago
  3. NeedsGoodAnswer
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    nope sure dont

    • 2 years ago
  4. asnaseer
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    what have you been taught about indexes?

    • 2 years ago
  5. NeedsGoodAnswer
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    nothing at all that i can recall

    • 2 years ago
  6. NeedsGoodAnswer
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    no pun intended

    • 2 years ago
  7. asnaseer
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    so how do they expect you to solve this? have you been told to use any specific method?

    • 2 years ago
  8. NeedsGoodAnswer
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    i think we have i just dont remember

    • 2 years ago
  9. asnaseer
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    well at the very least you need to know the rules of index multiplication and division.

    • 2 years ago
  10. NeedsGoodAnswer
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    prolly do just dont remember what they are

    • 2 years ago
  11. asnaseer
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    e.g. the rule I just showed you can be proved with following example:\[\frac{x^5}{x^3}=\frac{x*x*x*x*x}{x*x*x}=x*x=x^2\]

    • 2 years ago
  12. NeedsGoodAnswer
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    oooo thtz right i remember now thx

    • 2 years ago
  13. asnaseer
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    so in your case,\[3^{-9}/3^{-12}=3^{-9-(-12)}=3^{-9+12}=3^3\]

    • 2 years ago
  14. NeedsGoodAnswer
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    yup i got it thanks alot

    • 2 years ago
  15. asnaseer
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    yw

    • 2 years ago
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