Question

Find the 9th term in the sequence.
-28, 172, 372, 572, 772,

Answer 1

1572 is the answer.

Explanation:

-28,172,372,572,772

divide by 4:-

-7,43,93,143,193

Here common difference is +50.

So,

using the formula:-

nth term = {a+d(n-1)} * 4

= {-7 + 50(n-1) } * 4

= {-7 + 50n - 50} * 4

= 200n - 228

Now,

9th term = 200(9) - 228 = 1572.