Question

Ninth term of AP is -32. Sum of 11th term and 13th term is -94. Find common difference. Answer fast pls

Answer 1

Answer:

-5

Step-by-step explanation:

9th term = a+(9-1)d = a+8d = -32--(2)

11th term = a+(11-1)d = a+10d

13th term = a+(13-1)d = a+12d

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

2a+22d=-94

a+11d=-47---(1)

(2)-(1):

-3d=15

d=-5

the common difference is equal to -5

Answer 2

Answer:

d= -5

Step-by-step explanation:

9th term = a+8d = -32 ...... (1)

sum of 11th term and 13th term means

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

2a+ 22d = -94 .... ( 2)

solving two equations by eliminating method you get common difference

therefore, common difference d = -5