Question

The eighth term of an A.P is -23 and the twelfth term is -39. Determine the A.P

Answer 1

Answer:

5 , 1, -3 , -7 , -11 , - 15 , -19 , -23 , -27 , -31 , -35 , -39

Step-by-step explanation:

8th term = a + (8-1)d

=> a +7d = -23

12th term = a + (12-1)d

=> a + 11d = -39

4d = - 16

d = -4

a + 7(-4) = -23

a = 5

ap

5 , 1, -3 , -7 , -11 , - 15 , -19 , -23 , -27 , -31 , -35 , -39

an = a + (n-1)d

an = 5 + (n-1)(-4)

an = 9 - 4n