Question

in an ap an=3n+5,then the 8th term is​

Answer 1

Answer:

29

Step-by-step explanation:

Formula of nth term in A.P is a+(n-1)d

Where “a” is ist term and “d” is common difference

according to qustion

a+(n-1)d=3n+5

a+nd-d=3n+5

nd+(a-d) =3n+5

Compare this equation,we get

d=3 & a-d=5

a-3=5

a=8

Seventh term=

8+(8–1)3 =29

Ans will be 29

Answer 2

Answer:

$\huge\bold{\green{Answer :}}$

• Given an = 3n + 5

a(1) = 3(1) + 5 = 8

a(2) = 3(2) + 5 = 11

common difference(d) = a2 - a1

                                     = 11 - 8 = 3

∴ d = 3

an =a + (n - 1)d

a8 = a + 7d

    = 8 + 7(3) = 29

∴ 8th term is 29

Step-by-step explanation: