а) a1 = -4
d = a2 - a1 = -8 -(-4) = -8 +4 = -4
an - ?
an = a1 +d(n-1)
an = -4 -4(n-1)
an = -4 -4n +4
an = -4n
б) а1 = 5
d = -7
an = 5 -7(n-1)
an = 5 -7n +7
an = -7n +12
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а) a1 = -4
d = a2 - a1 = -8 -(-4) = -8 +4 = -4
an - ?
an = a1 +d(n-1)
an = -4 -4(n-1)
an = -4 -4n +4
an = -4n
б) а1 = 5
d = -7
an - ?
an = a1 +d(n-1)
an = 5 -7(n-1)
an = 5 -7n +7
an = -7n +12