wyznacz różnicę ciągu (an), który określony jest wzorem an=7n-9
a₁=7-9=-2
a₂=14-9=5
r=a₂-a₁
r=5-(-2)
r=7
An =7n -9
An +1= 7(n+1)-9
= 7n + 7-9= 7n -2
7n-2-7n+9 = 7
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a₁=7-9=-2
a₂=14-9=5
r=a₂-a₁
r=5-(-2)
r=7
An =7n -9
An +1= 7(n+1)-9
= 7n + 7-9= 7n -2
7n-2-7n+9 = 7