Solution:
Tn = 7 – 4n
Tn-1 = 7 – 4(n – 1)
= 7 – 4n + 4
= 11 – 4n
d = Tn – Tn-1
= (7 – 4n) – (11 – 4n)
= 7 – 4n – 11 + 4n = -4
d = -4
Solution:
Tn = 7 – 4n
Tn-1 = 7 – 4(n – 1)
= 7 – 4n + 4
= 11 – 4n
d = Tn – Tn-1
= (7 – 4n) – (11 – 4n)
= 7 – 4n – 11 + 4n = -4
d = -4