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26 June, 21:27

What is the nth rule of the quadratic sequence 4,15,30,49,72,99,130

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  1. 26 June, 21:32
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    2 (n²) + 5n-3

    Step-by-step explanation:

    4,15,30,49,72,99,130

    1st you find the difference between the numbers: (e. g. difference between 4 and 15 is 11) 11,15,19,23,27,31 Then you find the second difference between them. 4,4,4,4,4,4

    If you divide the second difference by 2, you will get the value of a. 4 : 2 = 2

    So the first term of the nth term is 2n²

    Then you have to do what do you do to get from 2n² to 4,15,30,49,72,99,130
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