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f(-3) = -15
f(-3) = -3a + b
-3a + b = -15....(1)
f(3) = 9
3a + b = 9...(2)
eliminasi (1) dan (2) diperoleh a = 4, b = - 3
f(x) = ax + b = 4x - 3
f(-2) + f(2) = {(4.(-2) - 3) + (4.2 - 3)} = {(-8 - 3) + (8 - 3)} = (-11 + 5) = -6