Sprawdź czy ⅖ po podstawieniu za x spodowuje ciąg arytmetyczny.
Liczby: 4x²-1 , 6x+1 , x²+7.
a1 = 4x²-1 = 4 * (2/5)² - 1 = 4 * 4/25 - 1 = 16/25 - 25/25 = - 9/25
a2 = 6x+1 = 6 * 2/5 + 1 = 12/5 + 5/5 = 17/5
a3 = x²+7 = (2/5)² + 7 = 4/25 + 175/25 = 179/25
a3 - a2 = a2 - a1
179/25 - 17/5 = 17/5 - (-9/25)
179/25 - 85/25 = 85/25 + 9/25
94/25 = 94/25
L = P
odp. Tak, otrzymamy wtedy ciąg arytmetyczny.
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a1 = 4x²-1 = 4 * (2/5)² - 1 = 4 * 4/25 - 1 = 16/25 - 25/25 = - 9/25
a2 = 6x+1 = 6 * 2/5 + 1 = 12/5 + 5/5 = 17/5
a3 = x²+7 = (2/5)² + 7 = 4/25 + 175/25 = 179/25
a3 - a2 = a2 - a1
179/25 - 17/5 = 17/5 - (-9/25)
179/25 - 85/25 = 85/25 + 9/25
94/25 = 94/25
L = P
odp. Tak, otrzymamy wtedy ciąg arytmetyczny.