Prüfe Vorzeichenwechsel: \( f(0) = -18 < 0 \), \( f(1) = 1 - 8 + 9 - 18 = -16 < 0 \), \( f(2) = 8 - 32 + 18 - 18 = -24 < 0 \), \( f(3) = 27 - 72 + 27 - 18 = -36 < 0 \), \( f(4) = 64 - 128 + 36 - 18 = -46 < 0 \), \( f(5) = -48 < 0 \), \( f(6) = -36 < 0 \), \( f(6.7) \approx 302.5 - 360.88 + 60.3 - 18 \approx -16.08 \), \( f(6.9) \approx 328.5 - 383.28 + 62.1 - 18 \approx -0.68 \), \( f(6.95) \approx 334.5 - 388.18 + 62.55 - 18 \approx 0.87 > 0 \). - Veritas Home Health