Jawabanmu

2013-12-15T22:49:02+07:00
Aritmetika ya?

S1 = a = 2(1^2) + 7
a = 2+7 = 9
S2 = 2(2^2) + 7
S2 = 8 + 7
S2 = 15
U2 = 15-9
U2=6
b=6-9
b=-3
U7=9+6(-3)
U7=9-18
U7=-9