If the 3rd and the 9th terms of an A.P. are 4 and −8 respectively, find a and d
Answers
Answered by
0
Step-by-step explanation:
a+2d = 4
a+ 8d = -8
-6d = 12
d = -2
a-4 = 4
a = 8
Answered by
0
Given:
a3 = 4
a9 = -8
To FInd:
a1
d
Solution:
a3 = 4
a + 2d = 4 .................... (1)
similarly
a9 = -8
a + 8d = -8 ,...................(2)
Npw, by subtracting 1 and 2 , we get:-
-6d = 12
d = - 2
Now by 1 , we get:--
a + 2(-2) = 4
a -4 = 4
a = 8
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