Math, asked by Shasishyshender, 1 year ago

the 9th term of an ap is -32 and the sum of its 11th and 13th term is -94 find AP

Answers

Answered by GinnyWeasley
21
term9 = a + 8d = -32       ____eq. 1

term11 + term13 = -94

(a + 10d) + (a + 12d) = -94

2a +22d = -94

a + 11d = -47       _____eq. 2

Now solving it simultaneously,
we get

 a+8d = -32
 a+11d=-47
-_________
    -3d= 15
       d=-5

Putting the value of d,

-32 = a + 8*-5
-32=a  - 40
a = 8

Therefore, the AP is  8 , 3, -2..........



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