.What is x if the sequence 1,5, 2x+3 ....is an arithmetic sequence?

1 Answer
Jul 20, 2016

x =3

Explanation:

If the sequence is arithmeic, then there is common difference between the consecutive terms.

d = T_3 -T_2 = T_2-T_1

(2x+3)-5 = 5-1" we have an equation - solve it"

2x = 4-3+5

2x = 6

x = 3

The sequence would be

1, 5, 9 There is a common difference of 4.