Question

Explicit formula for 1, -6, -13, -20

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

-7n + 6

Step-by-step explanation:

Let a = 1, a₂ = -6 and so on

Now,

a₂ - a = a₃ - a₂  = d => -7

Thus, this forms an AP

So, we know,

$a_n = a + (n-1)d$

Thus, $a_n = 1 + (n-1)*-7$

$a_n = -1 + -7n + 7 => a_n = -7n + 6$