Bonjour,
Uo = 1
Un+1 = –2 –2Un
U1 = –2 – 2×Uo
U1 = –2 – 2×1
U1 = –4
U2 = –2 – 2×U1
U2 = –2 – 2×(–4)
U2 = –2 + 8
U2 = 6
U3 = –2 – 2×U2
U3 = –2 – 2×6
U3 = –2 –12
U3 = –14
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Bonjour,
Uo = 1
Un+1 = –2 –2Un
U1 = –2 – 2×Uo
U1 = –2 – 2×1
U1 = –4
U2 = –2 – 2×U1
U2 = –2 – 2×(–4)
U2 = –2 + 8
U2 = 6
U3 = –2 – 2×U2
U3 = –2 – 2×6
U3 = –2 –12
U3 = –14