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...
Giải thích
Quadratic sequences have a second difference which is constant. Cubic sequences have a third constant difference.