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a = 8 >>
U4 + U10 = -8
= a+3b + a+9b = -8
= 8+3b + 8+9b = -8
= 16+12b = -8
= 12b= -24 b = -2
ditanya S7 = n/2 (( 2a + (n-1)b )) = 7/2 (( 2.8 + (7-1)x -2 )) = 7/2 ( 16-12 ) = 7/2 (4) = 14 (c).
nomor 1 udah dicari tapi gk ketemu, cuma itu doang.. semoga bermanfaat ^_^