Factor the following polynomials completely. 1. ×2 -2×y+y2 2.×2-×2y+y2 3. ×2-×-20. 4. 81×2-90×+25 5. 9a2-6ab=b2. 6. ×4-8×2+16 7.4y2+4y+1 8. ×2+10×+25 9.6×2+×-15 10.×2-3×-4​