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anonymous

  • one year ago

Expeess the series 1+4+9+16 using sigma notation

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  1. Empty
    • one year ago
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    Ahhh this is a fun one! Any ideas? Give it your best shot and guess and I'll help you understand. I remember when I first saw sigma notation I didn't understand it either, but through guessing I can understand where you need help in understanding.

  2. skullpatrol
    • one year ago
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    want a hint?

  3. anonymous
    • one year ago
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    Yes

  4. Empty
    • one year ago
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    Not even gonna try? :(

  5. skullpatrol
    • one year ago
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    $$\Huge1^2 = 1$$$$\Huge2^2 = 4$$$$\Huge3^2 = 9$$$$\Huge4^2 =16$$

  6. anonymous
    • one year ago
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    Do i add 1+4+9+16 by any chance? Sorry i dont remember how to do this

  7. skullpatrol
    • one year ago
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    yes

  8. skullpatrol
    • one year ago
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    Sigma notation is a shorthand way of writing: n + (n+1) + (n+2) + ...

  9. skullpatrol
    • one year ago
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    \[\sum_{1}^{4}\]

  10. skullpatrol
    • one year ago
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    "Sigma" means "sum"

  11. anonymous
    • one year ago
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    Oh ok.

  12. skullpatrol
    • one year ago
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    |dw:1436362346004:dw|

  13. anonymous
    • one year ago
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    1+4+9+16 =30 So n^2 has to equal 30 too?

  14. skullpatrol
    • one year ago
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    30 is what the sum equals.

  15. skullpatrol
    • one year ago
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    |dw:1436362667428:dw|

  16. skullpatrol
    • one year ago
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    |dw:1436362706460:dw|

  17. skullpatrol
    • one year ago
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    recall: 4! = 1*2*3*4 = 24

  18. skullpatrol
    • one year ago
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    that^ is called factorial notation

  19. skullpatrol
    • one year ago
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    sigma notation uses pluses

  20. anonymous
    • one year ago
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    Ok

  21. anonymous
    • one year ago
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    So is the answer is n^2=30?

  22. skullpatrol
    • one year ago
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    |dw:1436441192523:dw|

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