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noname81

  • 3 years ago

The terms 5x+2, 7x-4, and 10x+6 are consecutive terms of an arithmetic sequence. Determine the value of x and state the three terms. I was just introduced to Tn=T1+(n-1)d so if I can answer using this equation that would be great

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  1. cwrw238
    • 3 years ago
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    an arithmetical sequence has a common difference (d) so in this case d = (7x - 4) - (5x + 2) = 2x - 6 also d = (10x + 6) - (7x - 4) = 3x + 10 therefore 2x - 6 = 3x + 10 do you follow this?

  2. noname81
    • 3 years ago
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    ok but would the difference between the T1 T2 T3 be the same?

  3. cwrw238
    • 3 years ago
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    yes t2 - t1 and t3 - t2 are the same - thats what an arithmetical sequence is eg 2 , 4 , 6

  4. noname81
    • 3 years ago
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    ok I follow so far

  5. cwrw238
    • 3 years ago
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    now solve the equation to find x: 2x - 6 = 3x + 10 -6-10 = 3x - 2x x = -16 now you can find the first 3 terms by plugging x= -16 into the terms in x first one T1 = 5x+ 2 = 5(-16) + 2 = -78

  6. cwrw238
    • 3 years ago
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    now you can get the 2nd and third by plugging in x = -16 as above or you can use the formula for Tn which you quoted in your question

  7. noname81
    • 3 years ago
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    awesome.Thanks for the help:)

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