1. 5a(2a-5)-12(3a²-a+4) = 10a²-25a-36a²+12a-48 = -26a²-13-48
2. (-5)(7a³-4a²)-(-2a²-3a+2)4a=-35a³+20a²+8a³+12a²-8a=-27a³+32a²-8a
1. 5a(2a-5)-12(3a²-a+4) = 10a²-25a-36a²+12a-48 = -26a²-13-48
2. (-5)(7a³-4a²)-(-2a²-3a+2)4a=-35a³+20a²+8a³+12a²-8a=-27a³+32a²-8a