Question

for an AP term7 is 4, common difference is -4 then what is the first term if the AP
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Answer 1

Step-by-step explanation:

Formula of A.P is,

an=a1+(n-1)d

a7=a1+(n-1)d

4=a1+(7-1)(-4)

4=a1-24

4+24=a1

28=a1

a1=28

Answer 2

Answer:

a7 = 4

d = -4

a7 = a+6d

4 = a +6(-4)

4 = a - 24

a = 24+4

a = 28