(1) x²-2xy+y² (2)16+8t+t² (3)25x²-30x+9 (4) 9+12t+4t²(5) x²+4x+4 (6)x²-10x+25 (7)mx²+14mx+49m (8)2x²-16x+32(9) 5x³-20x²y+20xy² (10) a.a.a.a+18a³+82a² (10)-64+16m-m² (11)-14a²+7.(a.a.a)+7a