Question

If the 3rd and the 9th terms of an AP are 4 and -8 respectively. Find the first term and common difference.​

Answer 1

Answer:

First term = 0

Common difference = 2

Step-by-step explanation:

Formula for AP = a + (n-1)d

3rd term is a + 2d = 4  this is equation(1)

9th term is a + 8d = -8 this is equation(2)

Solve equation 1 & 2

then you get

d = 2  

then put d in equation (1)

a + 2d = 4

a + 2*2=4

a = 4 - 4

a = 0