Question

5.) Write the explicit formula for the arithmetic sequence. -18, -7, 4, 15, 26,...​

Answer 1

an = -18 +11(n -1)

Explanation:

We notice that the first term (a1) is -18, and the common difference (d) is -7-(-18) = 11. Filling these values into the form for the explicit formula gives ...

an = a1 +d(n -1)

an = -18 +11(n -1)