Check \( f(0) = -18 \), \( f(1) = 1 - 8 + 9 - 18 = -16 \), \( f(2) = 8 - 32 + 18 - 18 = -24 \), \( f(3) = 27 - 72 + 27 - 18 = -36 \), \( f(4) = 64 - 128 + 36 - 18 = -46 \), \( f(5) = 125 - 200 + 45 - 18 = -48 \), \( f(6) = 216 - 288 + 54 - 18 = -36 \), \( f(6. - Crosslake