Question

Find the series formed by the first three terms of the sequence an = 2n – 4.

1, 2, 3

1 + 2 + 3

-2 + 0 + 2

-2, 0, 2

Answer 1

Answer: -2 + 0 + 2 on Ed

Explanation:

Answer 2

- 2, 0, 2

Explanation:

To find the terms in the sequence substitute n = 1, 2, 3 into the rule, that is

`a_(1)` = (2 × 1) - 4 = 2 - 4 = - 2

`a_(2)` = (2 × 2) - 4 = 4 - 4 = 0

`a_(3)` = (2 × 3) - 4 = 6 - 4 = 2

The first three terms are - 2, 0, 2