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r = -3
Sn = a(1-r^n)/(1-r)
S5 = a(1-(-3)^5)/(1-(-3))
-244 = a(1-(-243))/4
-244 . 4 = a 244
a = -4
U1 = a =-4
U2 = ar = 12
U3 = ar^2 = -36
U4 = ar^3 = 108
U5 = ar^4 = -324
U2 + U5 = 12 + (-324) = -312