Question

In an A P, if the common difference (d)= -4, and seventh term is 4, then find the first term.

Answer 1

a7=a+6d
4=a+6(-4)
4=a-24
a=28
the first term is 28

Answer 2

a7 = a + 6d

4 = a + 6(-4)

4 + 24 = a

28 = a

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