Które wyrazy ciągu są równe zero ?
( n^2 -36)( n +7) =0
n^2 -36=0 U n+7=0
n^2 =36 n=-7
n= -6 U n=6
n∈N ,więc:
odp:
n=6
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( n^2 -36)( n +7) =0
n^2 -36=0 U n+7=0
n^2 =36 n=-7
n= -6 U n=6
n∈N ,więc:
odp:
n=6