Question

Find an equation for the nth term of the arithmetic sequence.

a18 = 97, a20 = 281

an = -1467 - 92(n + 1)

an = -1467 + 92(n + 1)

an = -1467 + 92(n - 1)

an = -1467 + 92(n - 2)

Answer 1

the expression for nth term of an A.p. is : tn= a + (n-1)d
thus, a+17d=97
and a+19d=281
solvin these eqns....a=-1467
and d= 92
put these values in the eqn...

Answer 2

so this one an = -1467 + 92(n - 1) ??

Answer 3

yup