Mathematics for IGCSE & O level - Sequences (Section 2 - No. 5)
Identify the sequences that are quadratic sequences.
1, 4, 9, 16, 25...
1, 8, 27, 64...
2, 6, 12, 20, 30...
3, 7, 11, 15, 19...
Объяснение
Quadratic sequences have a second difference which is constant. Cubic sequences have a third constant difference.