Rozwiąż równania -13+(-7)+(-1)+5+11+...+x=64
L= suma ciagu arytmetycznego
a1=-13
r=6
Sn=(2a1+(n-1)r)n/2
64=(-26+6n-6)n/2
128=-32n+6n² /:2
3n²-16n-64=0
Δ=256+768=1024
√Δ=32
n=(16+32)/6=8
x=a8
x=-13+7*6=42-13=29
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L= suma ciagu arytmetycznego
a1=-13
r=6
Sn=(2a1+(n-1)r)n/2
64=(-26+6n-6)n/2
128=-32n+6n² /:2
3n²-16n-64=0
Δ=256+768=1024
√Δ=32
n=(16+32)/6=8
x=a8
x=-13+7*6=42-13=29