Question

What are the first four terms of the sequence represented by the expression n(n – 1) – 4? A. –2, 2, 6, 10 B. –3, 0, 3, 6 C. –4, –2, 2, 8 D. –5, –4, –2, 6

Answer 1

C

Explanation:

to find the first 4 terms, substitute n = 1, 2, 3, 4 into the expression

n = 1 → 1(1 - 1) - 4 = 0 - 4 = - 4

n = 2 → 2(2 - 1) - 4 = 2 - 4 = - 2

n = 3 → 3(3 - 1) - 4 = 6 - 4 = 2

n = 4 → 4(4 - 1) - 4 = 12 - 4 = 8

the first four terms are - 4, - 2, 2, 8 → C