Question

If nth term of an AP is 7 - 4n, then its common difference is

Answer 1

Answer:

a + n(d+4)-7

Step-by-step explanation:

nth term = a+(n-1)d

7 - 4n = a + nd - d

7 - 4n - nd = a - d

7 - 4n - nd - a = -d

d = a + nd + 4n - 7

Therefore, d = a + nd + 4n - 7 or a + n (d+4) - 7