anonymous
  • anonymous
Simplify 3^-9 / 3^-12
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
answers: 3^3 3^21 1/3^21 1/3^3
asnaseer
  • asnaseer
do you know the rule:\[x^a/x^b=x^{a-b}\]
anonymous
  • anonymous
nope sure dont

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asnaseer
  • asnaseer
what have you been taught about indexes?
anonymous
  • anonymous
nothing at all that i can recall
anonymous
  • anonymous
no pun intended
asnaseer
  • asnaseer
so how do they expect you to solve this? have you been told to use any specific method?
anonymous
  • anonymous
i think we have i just dont remember
asnaseer
  • asnaseer
well at the very least you need to know the rules of index multiplication and division.
anonymous
  • anonymous
prolly do just dont remember what they are
asnaseer
  • asnaseer
e.g. the rule I just showed you can be proved with following example:\[\frac{x^5}{x^3}=\frac{x*x*x*x*x}{x*x*x}=x*x=x^2\]
anonymous
  • anonymous
oooo thtz right i remember now thx
asnaseer
  • asnaseer
so in your case,\[3^{-9}/3^{-12}=3^{-9-(-12)}=3^{-9+12}=3^3\]
anonymous
  • anonymous
yup i got it thanks alot
asnaseer
  • asnaseer
yw

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