The explicit formula for the sequence is an = 5 + (n - 1)(-4)
Explicit rule of a sequence
The formula for calculating the nth term of an arithmetic sequence is expressed as:
an = a + (n - 1)d
where
a is the first term
d is the common difference
n is the number of terms
From the given data
a = 5
a2 = a1 - 4
a2 = 5 - 4
a2. = 1
d = a2 - a
d = 1 - 5
d = -4
Substitute
an = 5 + (n - 1)(-4)
Hence the explicit formula for the sequence is an = 5 + (n - 1)(-4)
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