Question

if last term of ap =7-4n find common difference

Answer 1

check the attachment

Answer 2

Nth term = an = 7-4n
first term = a1 = 7-4(1) = 7-4 = 3
second term = a2 = 7-4(2) = 7-8 = -1
second term - first term = a2 - a1 = common difference(d)
= -1-3 = -4
Therefore common difference(d) = -4