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1. f(-3) = -15 = -3a+b
2. f(3) = 9 = 3a+b
dieliminasi menjadi
-24 = -6a + 0
a = 4
maka masukan: 9 = 3x4 + b
9 = 12 + b
b = 9-12 = -3
lalu masukan
f(-2)+f(2)
-2a + b + 2a + b = 2b = = 2 x (-3) = -6
f(-2)+f(2) = -6