Liczby 2 , x-3 , 8 są w podaje kolejności pierwszym, drugim i czwartym wyrazem ciągu arytmetycznego. Oblicz x.
a₁ = 2
a₂ = x-3
a₄ = 8
8 = 2 + 3r
3r = 6
r = 2
x-3 - 2 = 2
x - 5 = 2
x = 7
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a₁ = 2
a₂ = x-3
a₄ = 8
8 = 2 + 3r
3r = 6
r = 2
x-3 - 2 = 2
x - 5 = 2
x = 7