Jawabanmu

2014-06-17T17:07:17+07:00
(a + b) + (a + 3b) + (a + 5b) = 6
3a + 9b = 6 atau a + 3b = 2 ..................................(1)

(a+3b)(a+5b) = - 24
     2(a+5b) = - 24
        a + 5b = - 12 ................................................(2)
        a + 3b =  2 -
             2b = - 14 maka b = -7
a + 3b = 2 atau a - 21 = 2 maka a = 23
U10 = a + 9b = 23 + 9(-7) = 23 - 63 = - 40
Jadi, nilai U10 = -40