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s1 = 1/2 (5(1) - 19)
= 1/2 (5 - 19)
= 1/2 . (-14)
= -7
s1 = u1 = a
s2 = 2/2 (5(2) - 19)
= 1 x (10 - 19)
= -9
s2 = u1 + u2
= a + a + b
= 2a + b
masukkan nilai a = -7
2a + b = -9
2(-7) + b = -9
-14 + b = -9
b = -9 + 14
b = 5