El profesor se sorprenderá mucho al ver tu solución correcta😉
3 2*y (y + 3) + 3*(y + 3) - (y + 3) = 0
y1 = -3.76191424271097 + 0.150042353223925*i
y2 = -3.76191424271097 - 0.150042353223925*i
y3 = -3.07361507940137 + 0.642268834726219*i
y4 = -2.57665199958119 - 0.568085665087224*i
y5 = -3.00000871845362 - 1.73207609028797*i
y6 = 1.5447880378077
y7 = -3.46158865152164 + 0.469531395100127*i
y8 = -2.21128471319325
y9 = -3.46158865152164 - 0.469531395100127*i
y9 = -3.46158865152164 - 0.469531395100127*i