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candycane2565

  • 2 years ago

What is the third term in the expansion of (x + 2)7?

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  1. candycane2565
    • 2 years ago
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    (x+2)^7

  2. cathyangs
    • 2 years ago
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    have you heard of pascal's triangle?

  3. candycane2565
    • 2 years ago
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    yes put i have to clue how to use it

  4. cathyangs
    • 2 years ago
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    1 11 121 1331 14641 15 10 5 1 1 6 15 15 6 1 1 7 21 30 21 7 1 ____^ that right there. 21 is the coefficient. The x's power starts at 7, and decreases by one each term. The 2 does the opposite. In the seventh row, the third number is the coefficient of this term. so x^5*2^3*21 is 168*x^5 do you get it, or would you like me to explain a bit more?

  5. candycane2565
    • 2 years ago
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    explain a little more please?

  6. cathyangs
    • 2 years ago
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    *oops. did my math wrong. it's x^5*2^2*21, which equals 84*x^5

  7. cathyangs
    • 2 years ago
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    ok...so you understand pascal's triangle, correct?

  8. candycane2565
    • 2 years ago
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    i get it now i got confused with your math but now i understand thank you sooo much

  9. cathyangs
    • 2 years ago
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    ok. I'm happy to help! :D

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