The third term in an arithmetic sequence is 15 and the fifth term is 23. If the first term is a1, write an equation for the nth term of this arithmetic sequence?

This may help-

Step-by-step explanation:

a + 2d = 15

 a + 4d = 23

   2d = 8

    d = 4

   a = 7

    Sequence: { 7, 11. 15, 19, 23,

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

answer: it's d

step-by-step explanation: