1. а^2+6а+9-6а
а^2+9
2. 16а^2+8а+1+8а+1
16а^2+16а+2
3. 14b^2-(16b^2+8b+1)
14b^2-16b^2-8b-1
-2b^2-8b-1
1. а^2+6а+9-6а
а^2+9
2. 16а^2+8а+1+8а+1
16а^2+16а+2
3. 14b^2-(16b^2+8b+1)
14b^2-16b^2-8b-1
-2b^2-8b-1