Question

Which expression can be used for the nth term in the pattern below?
5,32,77,140,221
A.9n^2-4
B.9n^2+4
C.9n+4
D.9n-4

Answer 1

@rodr1697

Answer 2

how you think it ?

Answer 3

Starting with 9n^2-4 (which does not necessarily mean that this is the correct answer), let n = 1, 2, 3, and so on, and determine whether this correctly predicts the given terms of the sequence.

Suppose that n=1. Then 9n^2-4 becomes 9*1^2-4. Is this equal to the first term of the given sequence? Please share your work.