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f(-3) = -3a + b <--------------- Bayangan -3
-15 = -3a + b
f(3) = 3a + b
9 = 3a + b <------------------ Bayangan 3
f(3) + f(-3) = 3a + b - 3a + b
9 - 15 = 2b
-6 =2b
b = -3 <-------------- nilai b
f(-2) + f(2) = { -2a + b } + {2a + b}
f(-2) + f(2) = 2b
f(-2) + f(2) = 2(-3) <------------------------- Masukkan nilai b
f(-2) + f(2) = - 6