Question

Please help with number 3 :)

Answer 1

n^2 + 3

n^2 - 2

3n^2.

Explanation:

(a)

n = 1 2 3 4 5

terms = 4 7 12 19 28

n^2 = 1 4 9 16 25

Subtract: 3 3 3 3 3

So the nth term is n^2 + 3

(b)

n = 1 2 3 4 5

terms = -1 2 7 14 23

n^2 = 1 4 9 16 25

n^2 - term = 2 2 2 2 2

So it is n^2 - 2

(c)

n = 1 2 3 4 5

terms 3 12 27 48 75

n^2 = 1 4 9 16 25

each term = 3 * n^2