Kurangkan bentuk aljabar berikut .

45a3 + 10a2 – 25a- 35   – 15a3+20a2-45a 
=45a3+15a3+10a2+20a2-25a-45a-35
=60a3+30a2-70a-35

gitusih kayanya

5(9a³+10a²-5a+7) – 5a(3a²+4a-9) =
45a³+10a²-25a+35-(15a³-20a²)+45a =
45a³+10a²-25a+35-15a³+20a²+45a =
45a³-15a³+10a²+20a²-25a+45a+35 =
30a³+30a²+20a+35