SOLUTION: -1, -3, -1, 5, 15 Find first differences for the sequence in order from a1 to a5. Determine whether or not the series is quadratic or not. A.) , 2, 6, 10; not quadratic B.) 2,

Question 1081255: -1, -3, -1, 5, 15
Find first differences for the sequence in order from a1 to a5. Determine whether or not the series is quadratic or not.
A.) , 2, 6, 10; not quadratic
B.) 2, 2, 6, 10; quadratic
C.) -2, 2, 6, 10; not quadratic
D.) -2, 2, 6, 10; quadratic
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Calculate the first difference by subtracting,

Do the same for the remaining numbers.
.
.
.
Then calculate the second difference.

If all the second differences are equal, the series is quadratic.
Else it is not.

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