Dany jest ciąg o wyrazie ogólnym an = (-1)^n * (25 - 9n^2). Ile wynosi różnica a2-a1?
an=(-1)^n *(25-9n²)
a₁=(-1)¹*(25-9*1²)=-1*16=-16
a₂=(-1)²(25-9*2²)=1*(25-9*4)=25-36=-11
a₂-a₁=-11-(-16)=-11+16=5
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an=(-1)^n *(25-9n²)
a₁=(-1)¹*(25-9*1²)=-1*16=-16
a₂=(-1)²(25-9*2²)=1*(25-9*4)=25-36=-11
a₂-a₁=-11-(-16)=-11+16=5