anonymous
  • anonymous
Write the sum using summation notation, assuming the suggested pattern continues. -9 - 3 + 3 + 9 + ... + 81 Could someone please help?? I will medal, but I just don't understand these problems.
Mathematics
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anonymous
  • anonymous
Write the sum using summation notation, assuming the suggested pattern continues. -9 - 3 + 3 + 9 + ... + 81 Could someone please help?? I will medal, but I just don't understand these problems.
Mathematics
jamiebookeater
  • jamiebookeater
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Hero
  • Hero
Hint: Write the numbers as exponents.
anonymous
  • anonymous
So... -3^2 - 3^1 + 3^1 + 3^2 ...
anonymous
  • anonymous

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Hero
  • Hero
Yes
Hero
  • Hero
Write 81 as an exponent
anonymous
  • anonymous
9^2 or 3^4 ? @Hero
Hero
  • Hero
Think about it.
anonymous
  • anonymous
Yes, it is 3^4, so in total: -3^2 - 3^1 + 3^1 + 3^2 ... 3^4
anonymous
  • anonymous
Hero
  • Hero
Good. What number exists between 3^2 and 3^4?
anonymous
  • anonymous
3^3
Hero
  • Hero
Exactly. So now you can write using summation notation since you have the complete pattern.
anonymous
  • anonymous
I'm confused on how to write it into summation notation.
Hero
  • Hero
Do you know what summation notation looks like?
anonymous
  • anonymous
Yes, I do.
Hero
  • Hero
Well, then you should try your best to write the pattern in summation notation. Don't be afraid to make a mistake.
anonymous
  • anonymous
Ok I'll give it a try. Thanks!

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