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,

Algebra ->  Test -> 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,       Log On


   

Question 1081294: -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 MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

-1 | | -3 | | -1 | | 5 | | 15
| -2 | | 2 | | 6 | | 10 | .........first differences
| | 4 | | 4 | | 4 | | .........second
means it's quadratic

a%5Bn%5D+=+2n%5E2+-+8n+%2B+5 (for all terms given)
D.) -2, 2, 6, 10; quadratic