Diketahui barisan aritmetika U5=8 dan U9=20.suku ke -10 adalah? Yg bsa tlg jwb.

U5 = 8, u9 = 20. 12/4 = 3. Jadi u10 = u9 + 3 = 20 + 3 = 23

U 5 = 8 U8 = 20 b = 20 - 8 / 9 - 5 = 12 : 4 = 3 U5 =a + 4b a + 4( 3 ) = 8 a + 12 = 8 a = 8 - 12 = - 4 U10 = a + 9b U10 = - 4 + 9(3) = 23