Dik : a=12 u8= -37. Di tanya : b= ? U14=? Jumlah 16 suku pertama=?

b = (-37-12)/(8-1) = -49/7 = -7
U14 = a + 13b = 12 + 13 x (-7) = -(91-12) = -79
U16 = 12 + 15x(-7) = -(105-12) = -93

S16 = 16/2 x (12 - 93) = 8 x (-81) = -648

b= -7, U14 = -79, S16= -648