Question

if 5times the 5th term is equal to the 8times its 8th term find its 25th term​

Answer 1

Answer:

5(a+4d)=8(a+7d)

solving

a=-12d

25th term =a+24d=a+(-12d)×-2=a-2a=-a

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Answer 2

Answer:

5 × (a + 4d) = 8×(a + 7d)

5a + 20d = 8a + 56d

5a - 8a = 56d - 20d

- 3a = 36d

-a = 12d or a = -12d

Now,

25th term = a + 24d

= -12d +24d

= 12d.

Hope it helps..