Jawabanmu

2013-12-09T14:41:38+07:00
Un = a + (n - 1)b
9b-4b= 26 - 56
5b = -30
b = -6.................... beda = -6
..................kita coba cari U1
U4 = a + (4-1)-6
56 = a + ( 3 ) -6
56 = a + ( - 18 )
56 + 18  = a....................kalau berpindah ruas maka - berubah menjadi lawannya (+)
74 = a............. u1 = 74
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Sekian :D
Sudah saya Uji ternyata Betul....... :D
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