Question

an ap is the common difference equal to -4 and the 7 term is 4 then find the first term

Answer 1

d=-4
a7=a+6d
4=a+6(-4). (a7=4) (d=-4)
4=a-24
4+24=a
28=a



Hence, 28 is the first term of AP

Answer 2

d = -4
a7 = 4

a7 = a + 6d
a = 4 - 4*(-4)
a = 4 + 24
a = 28