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Is this a quadratic sequence?
 6; 9; 14; 21; 30; ...
in Mathematics by Diamond (42,470 points) | 18 views

1 Answer

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To find out, lets check if the 2nd difference is constant item:

1st difference = 9-6; 14-9; 21-14; 30-21; ...

                        = 3; 5; 7; 9; ...

2nd difference = 5-3; 7-5; 9-7; ...

                       = 2; 2; 2; ...

therefore it is a quadratic sequence.
by Diamond (42,470 points)

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