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Verified answer
Dik : a = 32n = 8
b = 16 -32 = -16
Dit : S8...?
penye :
Sn = 1/2n(2a + (n-1)b)
S8 = 1/2x8(2x32 + (8-1)x-16)
S10 = 4( 64 + (7)x-16)
S10 = 4(64 + (-112)
S10 = 4x(-48) = -240
^_^
bener?