f(-4) = -(-4)^2 + 3(-4) = -16 - 12 = -28
f(1/3) = -(1/3)^2 + 3(1/3) = -1/9 + 1 = 8/9
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f(-4) = -(-4)^2 + 3(-4) = -16 - 12 = -28
f(1/3) = -(1/3)^2 + 3(1/3) = -1/9 + 1 = 8/9